I think there should be a better way to do the checklist for these stickers and Famous Feats cards. Any team sticker could be backed by any Famous Feats card. Since there are 26 team stickers and 22 Famous Feats cards, there is a possibility of 572 different "variations". Thus the checklist should be 572 entries long? And since this is just a database of front/back images, you'd just have to load all the possible image combinations.
I think it'd be more practical to just separate the Stickers and Famous Feats into separate checklists.
Someday my cards may double in value and then be worth half of what I paid for them.