I sold a $20 giftcard to Taco Bell at Christmas on Ebay. I sent it in a #10 envelope with just a stamp on it. The buyer contacted me a week later saying she hadn't gotten it yet, and asked if I could track it. I couldn't because I hadn't gotten a DC#. I refunded her money, and learned my lesson. I don't know if she was being honest or not, but I felt I needed to refund her money.