yep madness- the "911" plate is quite attractive but the scooter isn't on DVLA database. The best you could hope for is to retain the number somehow but it would be non- transferable.
Can't see £900+ value personally.
I've got an Innocenti stamped airbox anyone can have for £300...............
I get the feeling he's been getting his mates to bid it up.
The whole picture looks set up to me. If it had been festering in those bushes for more than a few months I reckon the legshields would be rotten through.
I wouldn't be surprised if its a wind up and people have been making stupid bids that they've no intention of honouring. Apart from the frame (possibly), there's nothing much you could use. You might be able to keep the number plate but I doubt it.