Welcome to the forum.
To answer your first question, all the coins go to the same place to be wrapped. If you buy from the mint directly, you are paying the premium for the fancy paper and the shipping. The rolls you get from your credit union originated from the same place.
As for damage to the coins you get in the rolls, the same holds true for coins purchased from the mint. There may be less nicks or fingerprints because they are going through fewer hands. If you think about the bank itself, more than one teller may be holding the roll before you get it.
My advice to you is to save the 16 dollars and get the coins through your credit union.
To answer your first question, all the coins go to the same place to be wrapped. If you buy from the mint directly, you are paying the premium for the fancy paper and the shipping. The rolls you get from your credit union originated from the same place.
As for damage to the coins you get in the rolls, the same holds true for coins purchased from the mint. There may be less nicks or fingerprints because they are going through fewer hands. If you think about the bank itself, more than one teller may be holding the roll before you get it.
My advice to you is to save the 16 dollars and get the coins through your credit union.


















