How does anyone know by looking at some crappy ebay pictures? The only true way to find out is to open the cartridge up and inspect the PCB. Unless the artwork is fake, which honestly it doesnt look it.
This seller is indeed shady. He had a U.S. Gowcaizer a few months back that looked fake. There was also another seller from Dickenson Texas with the same photos selling the same game. It was probably his second account.
I would have to agree with the other's on this one. If the seller is not willing to open the cart or show you more pictures of what you are buying you should just save yourself the headache and not bother.