Bent Vario Sheets

I buy my Vario sheets from the same seller I think most people do on this board. The last two shipments I've gotten have been a little bent on corners from the packaging. It looked like a stack of Scott catalogs would get them back to the right shape in about 24 hours. I've tried stacking catalogs on them a couple of different ways for several days each and I don't seem to be making any headway.

Do I just need to let it go? Has anyone else experienced this and found a solution?

Thanks