Unless you're living in the fetid swampland of the deep south and prefer to keep the cards out for display, it's hard to imagine they would be harmed under normal storage conditions. I have kept all of mine in ordinary polyester sleeves and in cardboard storage boxes for over thirty years, with no detectable signs of environmental damage. Those cheapo plastic storage containers with tight lids that are sold in discount stores hold about a dozen standard count card boxes and are probably about as close to a hermetic seal as you could hope to find. Hope this helps.
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