Toning -- Artificial or Natural

toning

I have similar toned Buffalo's that I've little doubt are AT. They're beauties and UNC, but if they have been tampered with in any way how could they be considered MS? I also have a number of both U.S. and World coins that are in their original unperforated mint packaging that show a wide range of toning.
I have to admit that the iridescent Morgans and deep golden Franklins are eye candy to rival the most pristine blazer.

 

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How did it get that way?? From the spot on Washington's chin, it looks like it may have been stored in a humid safe without silica gel.

 

How'd it get that way

That would be my "guess", but because none of the other coins in the sealed package were toned, I would also bet that the Mint's wash may not have been totally removed before packaging.