[NiceDocter]

They may never be totally flat but Ive had some limited success with putting them in a plastic sleeve under a stack of heavy books for a prolonged period of time ( check on them every few months or so) thats if you have a year or so to wait.....careful, you dont want tons of pressure on them or they will go to AUTHENTIC as being squashed. I think every one of us has had some cards or memorabilia partially desecrated over the years .... its not a good feeling but live and learn. I remember the original plastic sheets has some kind of bad chemical in them that made a lot of cards either a) turn yellow b) get brittle or c) get this oily mess all over them. To say nothing about the screw down holders we thought were great (? bullet proof ?) and then we find out later that the grading services might call these cards ALTERED because they were smashed out too flat. Dont worry, the cards are still cool and many would be happy to have ones like you do. Rocky