would like to warn you of a loser

Why punish his wife? She didn't scam anyone. Not fun IMO
she's benefiting from his theft. also a lot of people don't know they have a thief in their neighborhood. wife and nbors can really put pressure on. it's worth a shot. Even tough police might not be able to do anything. it might start him to think. He's hoping you'll ignore him. keep the pressure on.