This seems a little more useful: drive bay drawer. I used to have on on my LAN party machine; I'd keep little essential stuff in there.
Or this: the rock safe
I lived in a house once that had a floor safe embedded in the concrete floor. We didn't even know it was there until a few months before we moved out. Never did find out what the combination was.
I am thinking of doing that in my current house as a place to stash some small valuables: a few hundred bucks in cash, passport, etc. (Okay, I'm such a geek that I accidentally spelled cash "cache". No, it's money not super-short term storage. Although this is a cache for cash... Oh, my head hurts!)