1938-1964 Jefferson Proof Diagnostics?

I have in my possesion a brilliant uncirculated 1964 and 1938 Jefferson nickels that I found from roll searching.

Now they both have full or at least mostly full steps, and upon magnification the legends are smooth and crisp.

Both of them however show little to no mirrorlike qualities except for on small areas bordering the lettering.

I know it's most likely these are just well-struck business pieces, but is there any way that exposure to air and moisture has dulled the finish on the coins? Also are there any telltale signs in the design that would indicate they were struck on proof dies? Thanks

I'd give pictures, but I'm afraid any that I could produce would be of very poor quality.