Well, that's Chris Ray, the "better half" of "NGF", such as it is. Since I don't have personal experience with him, all I can say is that his eBay feedback is very good and he should be a reliable seller. I don't think he'd jeopardize his high positive eBay feedback rating by stiffing someone on an auction. Its likely that you'd receive everything he pictured for the auction.
Only thing to keep in mind is that, I believe that the Neo Geo MVS 1-slot board is the newer type, and doesn't include home joystick connectors or headphone connector, which are nice to have with a supergun-equipped setup.