I’ve seen the “Honesty Test” in the past, but Mark Rober runs a pretty good one in his video below. Chock one up for “I didn’t know that,” Mark says if you find a wallet with an address in it, just drop it in any USPS mailbox and it will be delivered back to the owner for free. I could not find a definitive statement toward this on the USPS website, but found a few other discussions of it on the web. One, on the Art of Manliness blog, says that a better response would be to call the person right away if possible. That would save them the trouble of canceling all those credit cards and other IDs. At least you could give them a call and then drop it in a mailbox.