It worked in the resort where I was. It still works there and several other places where it has been adopted. The “victim” can’t prove that any particular person opened the wallet. It complicates things such that the opportunity for scam is not even taken advantage of. It is no longer he-said/she-said but more like he-said/all-of-those-people-said and there are no visible “clues.” In the case of the gun, had it been, indeed, a stolen gun that had been used to shoot someone criminally, the finder’s fingerprints on it would not be helpful at all to the finder. Without prints the police would have to find something else to tie him in and probably wouldn’t try. Prints would give police a chance to possibly “clear” a crime without having to work too hard.
I must have a criminal mind. I can totally see how that would be easily circumvented by the “robber”. Not discrediting what works, good job for coming up with a solution that works for so many businesses!