Hi Gary; welcome to the group!
As to why it didn't sell on the board, he may have been asking more at that time than anyone on the board was willing to pay at that time. I don't think a price was posted, so I don't know how much that was.
The current seller says they are selling for a friend. And the seller has numerous current listings for costume jewelry. This may be why you're not getting a response to your email. I doubt it's a scam. But you need to find your own comfort level.
In my opinion, the current bid is high; but that's just my opinion. Obviously the current bidder doesn't think so. If the listing had said that the bass has had the electronics upgrade, then the current bid would seem more reasonable; but it doesn't say that and it probably hasn't had the upgrade.
The seller confirms there is a power supply.
I can't remember what a coffin case is.
As I said in a previous post above, I really like that flamey pattern on the back. And I'm partial to Maple. I think it's a nice bass.
If you really like this particular bass as opposed to wanting an S1 in general, then that's a consideration in your decision.