Keeping them in a humid area can ruin cards even if still in sealed boxes. A few years ago a member sold several sealed boxes he had had for 25+ years. He never noticed it but when several of us received those boxes they reeked of stale mold. Of course the seller felt bad and refunded all of us.
I tried a few things but what worked best was to lay them out in the sunlight on my picnic table for a few days. Then after putting them back in the box I left them outside in the sun for several more days. Nothing else worked for me.
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