1970 Proof Set Real Or Fake

Here is the half dollar.

I have never in my life heard of fake proof sets. This is certainly not gonna be the first.

Please look at the left side of the penny and tell me what that is inside of the case?

Those are cracks in the plastic case. Looks like some spotting on some of the coins, like they weren't stored in the best of conditions.

Recently had to crack coins out of a 1968 proof set because some had gone hazy while others were pristine. I figured it was a broken seal and environmental issues.

Lesson Learned.

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.

Here's the highest grade one I have: