It's dumb as **** when GameStop opens a game if there's more than one copy. Sure, I understand that one is the display case, but then the rest (even if there's only one additional copy) is still taking up space behind the counter or in the backroom because it has to go somewhere and no one is buying a new game without the case, inserts and whatnot. So they're just opening the additional copies because ?? This is the exact reason I didn't buy Tales of the Abyss on 3DS from GameStop a few months ago. If a new game is opened, I don't buy it from GameStop. I'll still buy used games there if I can't find it new anywhere, but that's only on the very rare occasion when I realize I didn't buy a game I wanted. I think the last used game I bought from GameStop was A Boy and His Blob a few years ago.
If the games are opened, there's no way to tell if they're actually new. I wouldn't mind them doing this if they would sell the opened new game for the used game's price (which they would never do) unless they can prove without a shadow of a doubt that no one even play-tested the game (since that would ultimately mean it was used). Unfortunately, they cannot and my solution, again, is to just not buy new games from GameStop. Also, that seal sticker is total bullshit. I understand the purpose of it; I just hate that it doesn't come off clean.