I won a contest several years ago that entitled me to free PS2 games and accessories for a year. Each game I received also had a hole punched(not drilled) thru the barcode on the back of the game case. As these games were still factory sealed, the reason they did this was to prevent me(and others) from trying to take these games to a store and trying to get a refund or store credit for them. And thats probably why yours have the same holes in them.