Odd toning find. More photos added.

A couple of years ago, I went thru a small envelope with some coins in it, all Lincoln wheats. A 1945, 1945 D, a 1930 and a 1920. All were uncirculated. Both the 45 and 45 D toned like this and the 30 and 20 had no toning what soever. To my best guess, they were in the envelope for at least 12 or more years. I just wonder why only the two toned like this and the others did not. I'll try to round the others up and get photos of them all. I know I still have them.
Jim
When a man who is honestly mistaken hears the truth, he will either quit being mistaken or cease to be honest....Abraham Lincoln
Patriotism is supporting your country all the time, and your government when it deserves it.....Mark Twain
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Will wait until I see the pictures of the others.... I am sure there will be some interesting theories offered. Cheers, RickO