And I don't mean if you break a game or lose a game.
Here's a scenario fitting for our forum:
You have a black label version of Final Fantasy VII. A friend comes over with the exact same game and you sit them next to each other.
A little time goes by and when you go to pick up your game you can't figure out which one is yours. They are both identical, black label copies with no scratches or marks.
Would the idea of your friend taking your copy of the game home bother you? There's no way of knowing, but would you be sad knowing that the version left at your house wasn't the one that was sitting on your shelf for years before?