Ug... a porper is not the ONLY thing that will take a crimp out. In fact, it far from the best thing. It was only designed to keep a nice, even pressure on the cards to KEEP them from warping.
Two suggestions on top of the poper, which won't just up and fix your problem.
One. Find an empty spot on a desk or table, set the deck, out of the box, on the spot, and then put several heavy books on it for a few days.
Two. Make a card press. I got two flat pieces of wood the same size, bigger than the deck. I also got two steel plates with holes in the ends and several bolts and wing nuts. Put the deck between the wood blocks, put the wood and cards between the steel plates, and cinch everything together tight with the bolts. Apply even but firm pressure with the bolts and let it sit overnight. You want the cards to be as square together as possible and you want there to be a lot of pressure. This will flatten the cards as flat as they can possibly be and time will then heal your crimped cards.