Since you closed the previous thread without giving a chance to respond, I'm forced to create this new one. And I want to be absolutely cleart about this, I do not mean to critisize your work in any way, I find it to be one of the best "mods" I ever encountered and have all the respect in the world for your work. I want my input to make the game more enjoyable for everyone lucky enough to find this project, But...
Interchange keys are not more common because there are more of them, only Factory and Labs have less, all other maps have more keys.
I took a gander at staticLoot.json to see if I could spot the reson why I'm having this issue, and this is what I found:
Customs:
Dorm room 114 key: relativeProbability:28 & relativeProbability:696
Dorm room 206 key: relativeProbability:101 & relativeProbability:213}
Tarcone Director's office key: relativeProbability:115 & relativeProbability:44
Dorm room 220 key: relativeProbability:301 & relativeProbability:183
Shoreline:
Health Resort west wing room 205 key: relativeProbability":11 & relativeProbability:14
Health Resort west wing room 207 key: relativeProbability":12 & relativeProbability:21
Health Resort east wing room 310 key: relativeProbability":11 & relativeProbability:23
Reserve:
RB-PSP2 key: relativeProbability:6
RB-ORB1 key: relativeProbability":4 & relativeProbability:10
Interchange;
Power substation utility cabin key: relativeProbability:631& relativeProbability:2144
OLI cash register key: relativeProbability":2009 & relativeProbability:672}
IDEA cash register key: relativeProbability:641 & relativeProbability:2074
OLI office: relativeProbability:2089 & relativeProbability":681
KIBA inner: relativeProbability:323
As you can see, the relative probability all seem to be reasonable until you get to Interchange, when the numbers suddenly get a jump. These numbers perfectly explain me experience when looting jackets and filing cabinets. I also checked a previous version of SPT(3.1.1) where the Interchange keys usually had a relative probability in the 200:s. as did Shoreline. Reserve had it in the 100:s.
This might be a bug with the Live version of the game, but from seeing Streamers play the game I find that hard to believe, they still find keys at the "normal" interval.