WalletTest.com

From WalletTest.com:

…Each of the 100 lost wallets contained $2.10 in real money, a fake $50.00 gift certificate, some miscellaneous items and a clearly written ID card identifying the lost wallet’s rightful owner. We were curious as to how honest people would be and wanted to see how different groups would compare to each other.

(via My2SecondShelfLife)