This got me thinking, you might say "here we go again" xd
Beside the whole money thing that might or might not be bad, a way to implement it could be use a special pocket that holds money, obviously would be the belt slot.
It would open like a normal bag but have different slots for different things, the lantern already present (buy that thing, those hivers have families man), a "wallet" where you store money, and anything else could go there.
This way the AI could be programmed to specifically search wallets and have a chance to steal money items. Or search belt slots in general for other valuables (while at it, AI could also search backpacks, or just take them with all their content, it's a bad exploit that you can just store things there and nothing will be taken)
Also, Implementing (moddable) multi-slot bags (like the limbs system already does) could open possibilities for modders.
[EDIT] I'll just open another topic, might fit better.