The heading of the auction clearly states "7 Atlantic City $2.50 obsolete chips"

The description clearly lists all 7 chips.

If i recieved only 6 chips from the auction i would be doing the same as you. You obsviously bid on the auction expecting it to be as described. We all know it is the item description that counts. The photos are often incorrect. Such is the case when a scan of the chip is different then the one being offered. It will be the description that clarifies everything.