Q: Verify iTunes card use

Hi tztriangle,

Thanks for using the Apple Support Communities, and welcome to the Apple and iTunes community. Other than attempting to redeem the card again, there isn’t a way to check to see if an iTunes Gift Card has been redeemed. If you know the value of each card, you could manually compare the current iTunes balance available in your account, along with viewing your purchase history:

iTunes Gift balances - Apple Support

http://support.apple.com/en-us/HT202359

See your purchase history in the iTunes Store - Apple Support

http://support.apple.com/en-us/HT204088

Additionally, you can always contact us for assistance with iTunes Gift Cards and codes:

If you can't redeem your iTunes Gift Card or code - Apple Support

http://support.apple.com/en-us/HT201195

- Matt M.