This is what happened to me. I gave a friend $300 to buy gift cards for iTunes, and he got me six $50 cards in the Woodlands Best Buy store in Texas. This was in november 2009. Me and a relative redeemed three of these cards during the following months, but I only got around to redeeming the last three in september 2010. When I did, they didn’t work. The error I got was that these codes did not exist.