Need Advice

Maybe the airtite wasn't sealed well, I've gotten coins from the mint where the seal was bad.

Hmmmmm indeed. It may have been improperly handled before being put into the airtite. And like the others said, it may not have a good seal, or the way it's being stored is contributing to the toning. Could be all 3. The toning itself doesn't look bad. Definitely look into a dehumidifier like Schnauzer said. Are any of your other coins that you purchased around the same time exhibiting toning? If not, then I'm guessing ungloved hands are the culprit.

You may want to buy some air tights and transfer any coins showing toning to them. Then place the air tights in a 2x2 just to make sure. Whatever is causing that toning is already inside with the coins, so leaving them in there is not a good idea. Either something was in there when closed or there is an air leak in them now. Really small air leaks may take time but eventually will do that.
As noted toning, tarnishing, spotting, corroding, etc. to anything metal is created by substances in the air. A multitude of gases are always present such as moisture, Oxygen, Chlorine, Flourine, Sulfur Oxides and on and on.

I am guessing they are still in the mint capsules they were shipped in and I am not sure they are air tight like the after market airtite's are

I don't think you can assume that Airtite's are air tight either. I think if you check with the company you will find that they don't warrant the holders to be air tight either.

I would not attempt to remove the spots/hazing/toning unless you have no concern about reducing them to melt value. They don't look that bad in the pictures.

If it happend in the last 6 months it could be something else that caused it to tone that you added to your safe if thats where you kept them. I think anytype of battery, say like in a watch or something might cause that.

Dangerous if you don't know exactly what and/or how to do that. could end up doing worse than now.


Highly unlikely those batteries created that problem. They are usually incased in a holder and very doubtfull of an electrical current running through anything from them.