So, did SNK print only 10 copies or something? Seems like there's legit Neo Bomberman carts are non-existent.
I've been in the business since 1982 and I have no idea where you get this information from?
Another day, another bomberman boot
Protip, a lot of cheap legit carts were sacrified and converted to rarer games. So whenever you see a SNK logo, don't stop there and check for mask roms.
Don't ever think that a game is legit because there's still 2 or 3 mask roms on it though. You need to check the number written on the mask roms. Some bootleggers don't even bother to remove all the mask roms from the previous game so it could still be a bootleg. Each game has a number. Check the master list to know which number you need to look for. Neo Bomberman is 093 for exemple. If you see a board with 045 written on the mask roms, that means it's a bootleg made out of a Samurai Shodown cart. Hope this helps.