Dealer Sold Used Gun as New

[Lurch]

I would call the ATF and explain to them what is going on and see if they can run a trace on the gun and see where it actually has been. I would also call the manufacturer and ask them how they test fire their guns and document what they say. That may explain the powder burns but I doubt they test fit them into their pockets so who knows where all the lint and pet hair came from.

Also I would take pictures of everything you have found to date.