I own an exceptionally rare video game called "Bubble Bobble Part 2." No box unfortunately, but it functions just fine - I beat it the other day, as a matter of fact! Anyways, this is a game that goes for $200-$400 without a box (what I have). The question is: should I tear off the label of the rental store I bought it from? On one hand, having any superfluous junk on the cartridge may lower its value; on the other hand, it might increase its value, since I've heard before that this game was available at rental locations only. Any information on this would be very appreciated, thanks!