Want to keep your wallet? Carry a baby picture
Back when we used to sell Trager bags, we received one as a return that had a envelope inside. We opened the envelope to discover it contained a married couple's love letters and pictures of their growing family throughout the years. By the time we discovered this, the bag had traveled through enough channels that it was difficult to find the person who had returned it, but we did and were able to return the envelope to them.