Very nice set. You are one lucky person that someone likes you so much.

Now all you have to do is add the ones missing the mint marks.
That should keep you busy for a while.
If you're not familiar here is some info.
From the PCGS site about the 1968 Proof "No S" dime.
(And we mustn't forget the 1982 "No P" business strike dime.)
https://www.PCGS.com/coinfacts/coin...0c-no-s/5245"Jaime Hernandez:
This is the first proof coin that was accidentally struck by the United States Mint without containing the S mint mark.
There are only a few dozen examples known in all grades combined, making it an extremely scarce coin. Because of the small amount of coins in existence, it is very likely that the San Francisco Mint caught these mistakes very early in the production process. There are no Mint records providing any details for these coins, which makes them a complete mystery.
Several years later, the Mint also produced 1975 No S dimes which are even scarcer than the 1968 No S Dimes, (there only two 1975 No S dimes known). Other proof coins that are missing the S mint mark, include the 1970 No S dimes, 1971 No S nickels, the unique 1976 No S Ike and the very popular 1990 No S Lincoln cent.
.... "
Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.