Hmmm. Call me cautious, but the advert is vague to say the least. The Ebay transactions look like they're a market trader specialising in 007 aftershave and Hugo Boss shirts! Sport socks... two for a pound!
Absolutely no history of the engine, no opportunity to run it on inspection, oh and don't get me started on their grammar!
Get the seller to give you the serial number on their return to Blighty so you can check it with Suzuki, stolen outboards database. Could be legitimate, but better safer than sorry.