We get some fairly high humidity in my part of the country, but I've never had any issues with moisture in my safe deposit box. Sometimes I'll go 3-4 years without checking on my cards, and they've always been fine. We soak and dry our cards, so I don't see where a little moisture would have a devastating effect on them. I've seen dessicant packets turn into a mess before, so I wouldn't trust them. I've heard a piece of chalk can absorb moisture, never tried that. The way I see it, my cards have survived 100+ years on their own, why change things now!
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