I don't think you have to worry about the absence of the 'JS series' logo. If you go to the gallery section of
www.ibanezrules.com, you'll see that a lot of his JS3s don't have the logo, either.
If you ask me, you've got a great bargain there. I'd say go for it, but just to be on the safe side, I'd send a PM to Rich asking him to verify that serial number. He's an expert on that stuff.
Cool guitar, Zox.
Alwin