Doing some research, I found this list of unique identifiers and the bosses have most of these keys inside their backpack slots under the Aki_Data > Server > database > bots > types > (BossName).json so Im going to experiment by upping the loose loot modifiers (near the very bottom of the json file) and see what I get. It's theoretically possible to add these keys to the special loot as well to give them an additional chance roll to drop the keys.
I have an idea that could be neat which would just be taking all of these ID's for the map and add them to the respective bosses making it into a incentive to hunt down and kill the bosses to gain more access to the maps the bosses are in. This seems like it would be easy since it seems the first 2 characters of the unique identifiers are corresponding to the maps. for instance the "5d" id's are all belonging to the map reserve, so put them into his special loot or backpack and up the min max and boom. I could do the same for Rashala and customs etc...
I'm also going to change the Rashala json in order to fix the 50/50 chance of him spawning with either the golden TT or the PL-15. The wiki has him spawning on the EFT live servers with a glock, golden TT and a PL-15 however single player allows us to mod the game to be how we want it, so I'm going to change this. By default he has a 90% (located at the json file near the bottom "Chances: { "Holster": 90,) I'm changing this to 100 and deleting the PL-15 ID in the holster chance.
I found a list of key ID's from a quick google however its outdated. I'm going to update this list when I have spare time. the numbers in parenthesis are the total amount of keys associated with the maps according to the tarkov wiki. It's incomplete as of right now but I'll keep updating it when I'm motivated. I'm changing Shturman's "Special loot" to 1min 1max to give a 100% chance of receiving his key when you kill him. After a quick few google searches I found this page here on our forums teaching us how to find the ID's ourselves. Tutorial: How to get item IDs
Ill update this if I make anymore progress!
Key ID's
Customs (31)
543be5e94bdc2df1348b4568 Name : Key
5448ba0b4bdc2d02308b456c Name : Factory exit key
5672c92d4bdc2d180f8b4567 Name : Dorm room 118 Key
5780cda02459777b272ede61 Name : Dorm room 306 Key
5780cf692459777de4559321 Name : Dorm room 315 Key
5780cf722459777a5108b9a1 Name : Dorm room 308 Key
5780cf7f2459777de4559322 Name : Marked key
5780cf942459777df90dcb72 Name : Dorm room 214 Key
5780cf9e2459777df90dcb73 Name : Dorm room 218 Key
5780cfa52459777dfb276eb1 Name : Dorm room 220 Key
5780d0532459777a5108b9a2 Name : Customs office key
5780d0652459777df90dcb74 Name : Cabinet key
5780d07a2459777de4559324 Name : Portable cabin key
57a349b2245977762b199ec7 Name : Door key
590c62a386f77412b0130255 Name : Sliderkey Secure Flash drive
5913611c86f77479e0084092 Name : Trailer park cabin key
5913651986f774432f15d132 Name : VAZ key
59136a4486f774447a1ed172 Name : Dorm guard desk key
59136e1e86f774432f15d133 Name : Dorm room 110 Key
59136f6f86f774447a1ed173 Name : Car key
591382d986f774465a6413a7 Name : Dorm room 105 Key
591383f186f7744a4c5edcf3 Name : Dorm room 104 Key
5913877a86f774432f15d444 Name : The key to the gas station storage room
5913915886f774123603c392 Name : Military base checkpoint key
5914578086f774123569ffa4 Name : Dorm room 108 Key
59148c8a86f774197930e983 Name : Dorm room 204 Key
59148f8286f7741b951ea113 Name : Weapon safe key
5937ee6486f77408994ba448 Name : Machinery key
5938144586f77473c2087145 Name : Portable cabin key of customs Factory zone
5938504186f7740991483f30 Name : Dorm room 203 Key
593858c486f774253a24cb52 Name : Door key
5938603e86f77435642354f4 Name : Dorm room 206 Key
59387a4986f77401cc236e62 Name : Dorm room 114 Key
5938994586f774523a425196 Name : Dorm room 103 Key
593962ca86f774068014d9af Name : Unknown key
593aa4be86f77457f56379f8 Name : Dorm room 303 Key
5da743f586f7744014504f72 Name : USEC stash on Customs key
Shoreline (48)
5a0448bc86f774736f14efa8 Name : The key to the closed premises of the sanatorium
5a0dc45586f7742f6b0b73e3 Name : Office 104 West wing key
5a0dc95c86f77452440fc675 Name : Office 112 West wing key
5a0ea64786f7741707720468 Name : Office 107 East wing key
5a0ea69f86f7741cd5406619 Name : Office 108 East wing key
5a0ea79b86f7741d4a35298e Name : Health resort utility room key
5a0eb38b86f774153b320eb0 Name : SMW car key
5a0eb6ac86f7743124037a28 Name : Cottage back entrance key
5a0ec6d286f7742c0b518fb5 Name : West wing room 205 key
5a0ec70e86f7742c0b518fba Name : West wing room 207 key
5a0ee30786f774023b6ee08f Name : West wing room 216 key
5a0ee34586f774023b6ee092 Name : West wing room 220 key
5a0ee37f86f774023657a86f Name : West wing room 221 key
5a0ee4b586f7743698200d22 Name : East wing room 206 key
5a0ee62286f774369454a7ac Name : East wing room 209 key
5a0ee72c86f77436955d3435 Name : East wing room 213 key
5a0ee76686f7743698200d5c Name : East wing room 216 key
5a0eeb1a86f774688b70aa5c Name : West wing room 303 key
5a0eeb8e86f77461257ed71a Name : West wing room 309 key
5a0eebed86f77461230ddb3d Name : West wing room 325 key
5a0eec9686f77402ac5c39f2 Name : East wing room 310 key
5a0eecf686f7740350630097 Name : East wing room 313 key
5a0eed4386f77405112912aa Name : East wing room 314 key
5a0eedb386f77403506300be Name : East wing room 322 key
5a0eee1486f77402aa773226 Name : East wing room 328 key
5a0eff2986f7741fd654e684 Name : Health resort room 321 safe key
5a0f006986f7741ffd2fe484 Name : Weather station safe key
5a0f045e86f7745b0f0d0e42 Name : Gas station safe key
5a0f068686f7745b0d4ea242 Name : Cottage safe key
5a0f075686f7745bcc42ee12 Name : Key to store safe
5a0f08bc86f77478f33b84c2 Name : Health resort management office safe key
5a0f0f5886f7741c4e32a472 Name : Health resort warehouse safe key
5a13ee1986f774794d4c14cd Name : West wing room 323 key
5a13eebd86f7746fd639aa93 Name : West wing room 218 key
5a13ef0686f7746e5a411744 Name : West wing room 219 key
5a13ef7e86f7741290491063 Name : West wing room 301 key
5a13f24186f77410e57c5626 Name : East wing room 222 key
5a13f35286f77413ef1436b0 Name : East wing room 226 key
5a13f46386f7741dd7384b04 Name : West wing room 306 key
5a144bdb86f7741d374bbde0 Name : East wing room 205 key
5a144dfd86f77445cb5a0982 Name : West wing room 203 key
5a1452ee86f7746f33111763 Name : West wing room 222 key
5a145d4786f7744cbb6f4a12 Name : East wing room 306 key
5a145d7b86f7744cbb6f4a13 Name : East wing room 308 key
5a145ebb86f77458f1796f05 Name : East wing room 316 key
interchange
5ad5ccd186f774446d5706e9 Name : Key to OLI administrator office
5ad5cfbd86f7742c825d6104 Name : Key to OLI logistics department office
5ad5d20586f77449be26d877 Name : Key to utility room of OLI outlet
5ad5d49886f77455f9731921 Name : Key to utility room of power substation
5ad5d64486f774079b080af8 Name : Key to pharmacy
5ad5d7d286f77450166e0a89 Name : Key to KIBA store outlet
5ad5db3786f7743568421cce Name : Key to EMERCOM medical unit
5ad7217186f7746744498875 Name : Key to OLI cash register
5ad7242b86f7740a6a3abd43 Name : Key to IDEA cash register
5ad7247386f7747487619dc3 Name : Key to Goshan cash register
5addaffe86f77470b455f900 Name : Key to KIBA Outlet grate door
5e42c81886f7742a01529f57 Name : Object #11SR keycard
5e42c83786f7742a021fdf3c Name : Object #21WS Keycard
Labs
5c1d0c5f86f7744bb2683cf0 Name : Lab. Blue keycard
5c1d0d6d86f7744bb2683e1f Name : Lab. Yellow keycard.
5c1d0dc586f7744baf2e7b79 Name : Lab. Green keycard
5c1d0efb86f7744baf2e7b7b Name : Lab. Red keycard
5c1d0f4986f7744bb01837fa Name : Lab. Black keycard
5c1e2a1e86f77431ea0ea84c Name : Lab. key. Manager office
5c1e2d1f86f77431e9280bee Name : Lab. key. Testing area (weap.)
5c1e495a86f7743109743dfb Name : Lab. Violet keycard
5c1f79a086f7746ed066fb8f Name : Lab. key. Arsenal storage room
5c94bbff86f7747ee735c08f Name : TerraGroup Labs access keycard
Factory
5448ba0b4bdc2d02308b456c Name : Factory exit key
57a349b2245977762b199ec7 Name : Pumping station front door key
593858c486f774253a24cb52 Name : Pumping station back door key
Woods (3)
5d08d21286f774736e7c94c3 Name : Shturman key
591ae8f986f77406f854be45 Name : Yotota car key
591afe0186f77431bd616a11 Name : Key ZB-014
Reserve (32)
5d80c60f86f77440373c4ece Name : RB-BK key
5d80c62a86f7744036212b3f Name : RB-VO key
5d80c66d86f774405611c7d6 Name : RB-AO key
5d80c6c586f77440351beef1 Name : RB-OB key
5d80c6fc86f774403a401e3c Name : RB-TB key
5d80c78786f774403a401e3e Name : RB-AK key
5d80c88d86f77440556dbf07 Name : RB-AM key
5d80c8f586f77440373c4ed0 Name : RB-OP key
5d80c93086f7744036212b41 Name : RB-MP11 key
5d80c95986f77440351beef3 Name : RB-MP12 key
5d80ca9086f774403a401e40 Name : RB-MP21 key
5d80cab086f77440535be201 Name : RB-MP22 key
5d80cb3886f77440556dbf09 Name : RB-PSP1 key
5d80cb5686f77440545d1286 Name : RB-PS81 key
5d80cb8786f774405611c7d9 Name : RB-PP key
5d80cbd886f77470855c26c2 Name : RB-MP13 key
5d80ccac86f77470841ff452 Name : RB-ORB1 key
5d80ccdd86f77474f7575e02 Name : RB-ORB2 key
5d80cd1a86f77402aa362f42 Name : RB-ORB3 key
5d8e0db586f7744450412a42 Name : RB-KORL key
5d8e0e0e86f774321140eb56 Name : RB-KPRL key
5d8e15b686f774445103b190 Name : Key to HEP station storage
5d8e3ecc86f774414c78d05e Name : RB-GN key
5d947d3886f774447b415893 Name : RB-SMP key
5d947d4e86f774447b415895 Name : RB-KSM key
5d95d6be86f77424444eb3a7 Name : RB-PS82 key
5d95d6fa86f77424484aa5e9 Name : Key RB-PSP2
5d9f1fa686f774726974a992 Name : RB-ST key
5da46e3886f774653b7a83fe Name : RB-RS key
5da5cdcd86f774529238fb9b Name : RB-RH key
