Via Kottke, this article on return of lost property in Japan. I'm reminded of some experiments done in this country--IIRC some involved leaving a wallet containing the owner's phone number with some money and seeing whether the wallet was returned, with the money.
I think maybe it ties in with my recent reading of McManus on the Army's war in the Pacific--how was it possible to motivate Japanese soldiers to die rather than surrender--partially a concern for reputation in the community?
The last thing I would think of if I found a wallet is whether my actions would be condemned or praised by the community.