I have never had the issue of altered stock from cards being in a screw down case - maybe just lucky until I learned about this happening on the net... Now however anything with a screwdown I get I take it out and let it sit in a humid room (basement) for a while... maybe the cardboard breathes in some humidity and expands back - I don't know but then it goes into penny sleeve and toploader... makes me feel better about that issue...
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