Well, I just picked up the package from the Post Office and one of the copies of Bomberman 2 worked perfectly on my 3DS XL. Thanks Hammer Bomber. Dunno when I'll put the other three copies up on eBay. I'm probably either going to charge $45 or $50 with about $3 or $4. It's overpriced, but the game is becoming harder to find in the U.K. and it's extremely difficult to find in the U.S. so I might as well make a decent profit.
Edit-
Though if anyone here from the U.S. is interested in owning the game, I'm not against the idea of offering it at a discount, especially since eBay takes part of the profit.