Ever since I was almost hosed at Fry's, my hard rule is to open and perform the best check I can before I leave the store. Hard to do with a video card outside of visual that it's at least the housing it claims to be. But it's something and because you never left there's zero provision for them to claim you are the one pulling any shenanigans.
Back during the first ThreadRipper days, I was going to buy I motherboard from them. Fry's was always on the slimier side of things, even their new boxes always had evidence of them having been opened. And they had a nasty habit of blaming everything on the customer to deny returns. So I opened the box in front of them only to find the pins on the mb socket were broken and bent. Had I left the store with that I _know_ they would have blamed me for the damage and denied the return.
"Trust", but verify! Always.