Shouldn't the offices... Idk look a little more like an office, maybe a pinup board on the walls? or some kind of monitor that has security feed in a certain room? idk to me the offices just don't look very... office.

Yes, also, if there are offices in the facility, maybe there could be a meeting room that generate which has an item inside?

Indeed, sounds like it'd be a good idea to have a meeting room, but what else could we add that'd possibly make it look more like an office? Photocopiers?

Maybe small easter eggs on the pinup boards.

Put a trollface with "THISISME WUZ HERE" on it.

Yeah how about a "Missing personnel" easter egg but instead it could have it that some immature staff has drawn a moustache on the missing persons face.