Thought it would be a cool idea if you could set up some traps inside loot boxes in case someone happened on your stuff while you weren't around. For example, an air horn trap that would not only alert you but also any Zombies walking around. Or maybe a tripwire poison dart to incapacitate the thief. Of course, the owner of the loot box wouldn't activate the trap when they open it up, or else it would become pretty tedious having to disarm and rearm it every time you open/close it. To make it more fair, it would be one of the later trap building skills. The thief can also detect and disarm it if their skill is high enough.