Yup! Humidity is the biggest danger..
Outside of theft, humidity is the biggest danger to cards. Although all normal matter particles are radiating away, the immediate threat is humidity. Also cool is better than hot to fight deterioration. The silica packs are excellent to eliminate excess humidity.
About 10 years ago I bought a childhood collection that had been stored in a "grain silo"? Cool and Dry.......The cards were absolutely pack fresh after almost 50 years. They were in shoeboxes in an open steel drum. A mouse had fallen in and it was actually mummified.
If you check on some paper conservation sites, other tips might be out there. Good question. David. ps Just an afterthought....If a TPG company has air tight slabs that would take care of the humidity concern, yes?
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