Yet another suggestion might be that the original zero feedback bidder was contacted to inform him that a zero feedback buyer bid would not be accepted and he then plonked in a huge bid at the close? It happens and may have happened to the seller previously? Just another guess, of course.
That zero-rated buyer may not be an ebay member by now, even. Epay favours sellers over buyers.
I’ve noted dodgy sellers with virtually zero feedback selling specific items which have very likely been adulterated before sale (if they actually exist at all) – ie removal of good parts and replacement with defective parts (yes, it happens). Epay remove them and they just open another account. Fairly obvious when the item location is the same town several times over.
On a high value item, I tend to pay cash on collection (and inspection).
My brother recently made a purchase but noted one part had been ‘accidentally removed’ from the box. It took quite some time before he received that part from the vendor. That prevented him from checking the item was working entirely as described, but his dispute was registered early so he is now going to check its operation very carefully…