Air-Tite coin holders were invented in 1980 and have not damaged a coin yet. That may not be 50 or 100 years but it is what it is.
Another recommendation for the hair dryer - I had the same problem, tried some of the other methods mentioned here, but the hair dryer was the winner..
Good enough for me to try that if I ever need to do it. But what I need to know, before I put any of my coins in Airtites is what's the best way to insert them in the first place without using my fingers?
It's quite easy really. I always suggest the ring type by the way. And before ever handling your coins - wash your hands ! Holding the coin by the edge, and with the bottom half, with the ring in it, open and exposed, ease the bottom edge of the coin into the holder and then just let go of the coin. Then put the top half on and push it shut. The top half of the holder will push the coin the rest of the way into the bottom half.
For starters, a coin won't get stuck in a foam-ring airtite as it has with the OP's direct-fit. That is, some coins don't fit perfectly in a direct-fit. Coins can get stuck or rattle annoyingly (at least I think it's annoying). A big plus for the foam-ring airtites: They can be used for over- and under-sized coins; cut the foam ring as needed. Especially handy for odd-shaped coins: But the foam ring will completely hide any edge inscription. And it takes a bit more storage space than a direct-fit.
I wouldn't use the refrigerator's freezer compartment if you have an active house where someone opens it every 20 minutes. But there should be minimum water vapor in a deep freezer temperature, and any on the surface would evaporate quickly