The factory set box states 73 cards. This seems to be one of those sets that has no actual base cards. It's a set of insert-type cards; Breaking Through (41), Legends (12), Stars (20), Jerseys, US Open Memories (18). The "base" cards are the non-autographed, no SN versions of certain "insert" sets. And were only available in the factory set. Including US Open Memories in the factory set would increase it to 91 cards.
arrrghh!! Which ones are in the factory set???
Someday my cards may double in value and then be worth half of what I paid for them.