That's the part I hate about the storage box, the cards can't be stored in them properly once you've removed the wrapping for the decks, or they warp really quickly (like, visibly in the space of under a week).
Cards warp depending on how they are stored? I didn't know that. I've been keeping my sentinels of the multiverse stuff stacked where they are standing straight up. Will this cause them to warp?
But for Dungeon command I didn't store them in the box they came in. I Sleeved them and put them in another box where they were laying flat. And they still warped. And what makes things worse is that the cards from Cormyr and lolth warped in a different direction then the cards from tyranny so when cards are combined it makes the deck do all sorts of weird things.