Frequently, Watchers have to sort stuff into Evidence, as valuable enough to put into the Evidence safe or just "put into evidence" and throw away. However- this means sorting it, putting it into evidence, seeing theres not enough space, walking all the way out to main upper to throw away some smaller bits from the safe, walking back, putting it in, repeat.
I'd suggest, in the second evidence alcove next to the actual safe, there be a disguised "small and non valuable evidence" safe object, like the actual safe, that is actually just a disguised trashcan.
It'd make sorting evidence 100 times easier, really, and save us a lot of time and loads back and forth.
Added.