i tried to use it 3 times
1) guy thought it was for 2 games of same platform, but offered to scan it for me anyway, and it worked like a charm
2) guy claimed he needed the full email printout to verify my identity/preorder status
3) girl took the coupon, and it scanned, but maybe splinter cell: da for 360 at an even $4 is too low and i only got +$10