So here on eBay we have an Australian, selling an Australian copy of Sonic The Hedgehog (SEGA Mega Drive), who claims that the game is uber-rare because while it is an Australian release, all the labels (front box, back box, manual, cartridge) read "SEGA Genesis" and not "SEGA Mega Drive." Is this guy spot-on, or is he off his rocker?

P.S. He wants $600 AUD for it.