FYI - its almost certainly illegal for the store to knowingly deal in stolen goods. depending on where you are, intent may not even matter. You've clearly shown that some of the cards on display were stolen. They aren't doing you a favor, they are following the law. Maybe I'm wrong, but I get the impression from your posts that the store isn't doing everything in its power to determine if they have any more of your cards.
If I were you, I'd bring the police in right now and have them deal with the store owner, and whoever sold them the stolen goods. Both parties may be innocent, but that doesn't mean they can just plead ignorance, and continue on their way. At the very least, both accepted/are in possession of stolen goods. Depending on state/local laws, its possible they've already committed a felony. If you think the cards crossed state lines, its entirely possible they've committed a federal crime. You meet the min dollar amount. Felony possession of stolen goods is a big deal with lots of consequences.
Anyways, all parties should be working with the police. not you.