Originally Posted by u-Bob

The opposite happened over here.

A TV show wanted to test the honesty of police officers. So they (the producers, researchers etc) all counted how much money was in their wallets. They then each took a wallet that belonged to one of their coworkers to a police station and told the cops that they had found the wallet (in the street, a train station, in a store etc) and filmed everything with a hidden camera. 2 or 3 days later, the owner of the wallet then went to the police station where his wallet had been dropped off and asked if maybe they had found his wallet. Again, filming everything with a hidden camera.

Result: 30% of the wallets had mysteriously disappeared.