Joe Mauer first year card set finds

I was thumbing through cards in a dollar box from a seller's table at a card show and started finding some Joe Mauer minor league cards - it was a no brainer to make at least one or two a keeper since it's just cool to have so long ago, formative cards of a player who has been minted as a Hall of Famer.

I do not know if these cards were from a legitimate issue or are particularly valued other than what I paid per card - since it looked like I found all the pieces towards a 10-card set, I put them in my keeper stack.