This is a nitpick on my part because I don't know who else feels the same way but-
[Spoilers for one of the easter eggs]
It'd be nice to be able to keep the briefcase as decoration instead of it going back to it's original spot every time you load in after moving it. Especially since the easter egg that it's needed for isn't even one that you can do in story mode. It's a nice easter egg and I think it's executed well, but I would also love to just have the briefcase as part of room decor instead of it just being naggingly in the bunker 24/7 and having to move it every time I go back in.