No idea. I can try to put in a code later today. Someone told me that you can guess the codes pretty easy, so perhaps that's what the site is talking about? I'd be pretty ticked if I paid for a code and someone else redeemed it on a guess. As these codes, they are off the tabs and if you can't redeem it, someone got to it before you. I had someone like the post before your comment. So, I assume he/she got it.