It's something I haven't really thought about, at least I hadn't until a couple I'm friends with had their (gorgeously painted) stuff stolen out of their trunk while their vehicle was in the shop having a tire replaced. Of course, they know that it couldn't have happened anywhere else, and of course, the shop (part of a big department chain) alleges that they had nothing to do with the stuff going missing. The shop did admit they needed to move the cases out of the trunk to get to a tire or something.
I'm not going to get more specific than that, as nothing has been proven other than with logic.
It was hundreds of dollars worth at least, and they have had no luck speaking with managers and whatnot as far as I know. Since we work at one gaming store, we're letting everyone there and at other stores know to keep an eye out for it.
I have the urge to get my camera out all of a sudden