This was advertised as a 1970 proof set. After looking at it under the scope I believe it has been tampered with. I'm looking for your thoughts. There are many pictures but I'm just going to post one coin per post. These coins are very shiny and were difficult to get clear shots.
I see nothing wrong. As usual, the coins have toned inside the case due to poor storage. Also, 1970 sets are notorious for producing toned coins, something about the original mint packaging.
The cent is 100% spot on with its toning pattern. I own and have traded/sold for probably 20 different 1970S rainbow toned coins. I'd like to see pictures of the cent out of that old mint holder. It should have some color to it unless the toning advanced too far - which it might have if your pictures are accurate.