Anyone that pawns ANYTHING at that store is an idiot.
And the store owners are COUNTING on idiots desperate for a few bucks which is why they placed their pawn shop right in the ghetto not far from the casinos.
Which is a perfect location. My XH was a pawnbroker/store owner. They specifically scouted locations where there were a lot of old apartments in a central location, and usually preferred a strip center with a liquor store in it.
They melted down gold all the time, but mostly “scrap gold”, which was usually 10K gold jewelry. I don’t recall them running across many gold coins, though.
If this daughter sold the coins outright, then the store owns them and they can do as they wish. No crime committed by them. The daughter’s the criminal here.