If you feel like your wallet has been picked up by a stranger, you can report it to the police, and they can check the CCTV footage to find it faster. Don't worry about bothering them; they can locate your wallet more quickly than you can. Even if it's been stolen, they can still find it. If too much time has passed and someone has turned it in at a service counter, you may not know which station it was turned in to, or it might have been taken directly to the police station.