A company I used to work with had a major problem with gift cards purchased from their online store. People would receive the gift cards and go to use them and nothing was on them. Calls were coming in one right after another for weeks! Turned out someone, I don't know how, had gotten hold of the card numbers and was using them all online before the cards had even been shipped out! Several different addresses had items shipped to them, amounting to tens of thousands of dollars of stolen gift cards.