Again, yep to the desiccant packs. About a year ago I opened a small safe I hadnt opened in a couple years. Important, but not valuable papers had significant moiture damage ( wrinkled and stuck together). I was shocked. I had a few slabbed modern cards in there that appeared unaffected. So since then, lots of desiccant in larger safes!! I live in midwest, lots of humidity, and yes my house is temperature controlled too. Dont risk it. You can dry out or " recharge" these packs every so often by putting them on a baking sheet and heating in over at 220 for 30 minutes or so. Cheap and in my experience a must
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