I just got a game off of Ebay disc only without a ESRB rating on the disc. I just thought it was weird as all the other games I own have it on there. It plays and is in English. It looks real and say NTSC on it.
Microsoft does not allow any game to be sold without an ESRB rating printed on both the box and the disk. That copy is a fake (either ISO burnt or completely blank). Happened to me a few times before at Gamestop (mostly Gamecube after they made blank mini-DVDs). Whenever I'm buying a game at Gamestop, I always ask to inspect the disk if it's used or, if it's new, ask for a sealed copy. If the latter, if the clerk pulls out an envelope, I walk out the door.
if the clerk pulls out an envelope, I walk out the door.
And this is why I do not shop at gamestop.
Note that I also said "ask for a sealed copy". Most of the time, I find that if you go straight to the register and ask for a new copy of the game, they will give you a sealed copy, but if you bring a display case, they will get the enveloped disk.