Warped 1975 Topps rack pack. Any advice?
 

Hello group:

Anyone have any smart (and ethical) ideas for straightening out an unopened 1975 Topps baseball rack pack? The one I've got isn't water damaged, but apparently was placed in an awkward position in the 75 rack box with weight on it, and over time -- possibly many years -- became warped. None of the showing cards are creased.

I've tried placing the pack in a vise with plywood for several weeks, but the cards always snap back to their prior warped position.

Let me know. Maybe this pack is destined to be warped forever.

Thanks.

Heavy book weighted down with bricks for about a year. I seem to recall reading about this once and it takes a long time to "unwarp" a stack of cards in a pack.

Open the pack and have a party
 

;)