I worked at an EB Games in 2005. The important thing to note us that EB didn't use the term "used" for games, but instead used "pre-played." I had a woman come in to buy Sniper Elite for her husband, but I didn't have any more sealed copies, just the gutted display boxes. She doesn't mind this and purchased it at the new game price.
A few hours later, I get an angry phone call from a man who says I sold his wife a used game and charged her for a new copy. He explains who she was and I tell him what happened. He freaks out and says that the game was opened, which makes it used. I let him know that we don't sell used games, we sell pre-played games and assure him that the disc was removed from the case, sleeved, and filed, which means it has never been played and is therefore a new copy. He gets loud, asks me how old I was (18), and goes off about how he is older than me and is a lawyer. He demands that he be refunded the difference between the prices, so I tell him that my store manager would be in the next morning and he could take it up with her. To my knowledge, he never called her, so I think he just gave up.
Source: https://www.reddit.com/r/AskReddit/comments/bicr5z/gamestop_employees_of_reddit_what_are_some_of/elzvk9w/