That (78 1113) is a well-known bass because of the unusual top wood. I've seen pics of it here before. The price is probably between half and two thirds of reasonable, so I would jump on it if you have a way to do it while remaining protected. If you don't, someone else will. $2350 for an SII bass is not going to last long at all. I have a short scale with Europa electronics that I wouldn't sell for under $3K.
As far as telling if it is legit, all you can really do is see if there is a payment method that will protect you from a scam. Either that, or see if there's a member here in the Syracuse area who could look at it for you. I do encourage you to move quickly if you want to own that bass, though.
-bob