Keep in mind, this guy isn't a coin dealer. He works at a pawnshop. He may not even be the owner and/or simply not care. Is he supposed to automatically trust a stranger's unsolicited evaluation and pull the coin based on that? If he knew enough to be able to know how to verify its authenticity, he wouldn't have bought it in the first place. So, the safe bet is on number 2 here - he just doesn't know what he's doing. Which makes this a good place to cherrypick, and the OP should keep going back there. But make sure when you do, you know what you're doing!
I’ve made enough mistakes buying. Probably will make more. Maybe he won’t want my business anymore anyway. The ASE was good learning in not falling for what at first seemed too good to be true.
He got me in the beginning when I knew squat, about $4.75 and that minor purchase could’ve been much worse at $9.75 with first quoting me $10, I probably posted about it here, a New Zealand Endeavour 50 cent piece. However, I got my 491 of 6000, $1 2019 Silver Piedfort at half new, so, yeah... my guard is always up there.
If sees a coin picked up by a magnet and still thinks it's silver, he has no business buying or selling coins and precious metals. Never mind what he may be doing to his customers, he'll find himself in a world of hurt if he pays half melt for a bunch of silver-plated iron Chinese Silver Eagles, never mind Chinese Gold Eagles...