Anyone know how to straighten warped cards?

[katnipp]

Had many of my figures boxed-up in a storage building and with this summer's heat, some of the cards are very slightly warped.

[ACPin]

If it's just the edge that's warped, try putting it inside a protective case. Otherwise, you'll just need to let it sit under the weight of a heavy book for sometime. There is no guarrantee that the warp won't turn into a crease however. None of this would work if the warp had occurred at the back of the bubble. If that's the case, you might be better off buying the same figure new and returning the warped one back.