Ok, I Have A Dilemma.....

Agree with coppercoins give him everything that is genuine and, of course, explain that these are worth more than face value and should not be spent.

[one option there is to let him know that if he gets tired of the coins you will buy them back for a few times the face value]

And there is something you'll always really wonder about. Just where did all those coins come from. As noted could be a massive amount of different things that made those rolls. Might have just been in cans, boxes, jars all over someone's house until they needed money. A home invasion where a coin collection was robbed. A coin collection that someone thought was just old coins.
I would have gone back to that bank and asked if there was any more of those just in case.