So i'm about to move out next week, I take a snapshot of the key (that's in my possession right now), pay with a prepaid Visa, and take next occupants stuff. Easily s/apartment/office. Flawless, proof that just because you can, doesn't mean you should.
Exactly the same thing can be done by visiting a hardware store, or any other store that makes copies of keys.
Though, the same could be said for a PO box delivery with an anonymous pick-up.
I think at this rate, I'll just break into my old apartment! ;)