According to a psychology study by Richard Wiseman in Edinburgh, Scotland , the likelihood that your lost wallet will be returned to you is influenced by the photos in it. The highest percentage of wallets were returned when there was a baby picture inside (88 percent), but the next most effective photo was one of a dog at 53 percent. A family portrait prompted a 48% return rate while wallets with photos of an elderly couple were only returned 28 percent of the time. Only 20 percent of wallets without photos but containing a charity receipt were returned, and 15 percent of those without a photo or a receipt were turned in. So, that photo of your dog may be great insurance against the loss of a wallet, though a baby picture is even better.