Considering that persons listings all consist of 10+ coins per listing and the nickel listing is a single item listing I think it was found in change or taken from an Uncirculated Set.
@CanadianCoins a lot of banks don't have new rolls. I asked for $50 in dimes from my local TD the teller picked up 4 new rolls and went to put them back down again until she realized there was no other dimes in the drawer. She was hesitant but handed over 2010 uncirculated rolls.
You can also order the boxes from the Mint, but there are admin and shipping fees attached. Better to make friends with a teller.