At no point did I encounter anything resembling the Kafkaesque web of strategic incompetence that I half expected. They followed up every step of the way with courtesy and professionalism even though the seller had woven a substantially more convincing lie than in OP's case -- they had a many year history of selling equipment and radio astronomy books along with two previous successful VNA sales. Evidently it was an account hijack. In this price bracket, even a solid account history isn't a guarantee.
I no longer resent the 10% cut eBay takes. They saved my bacon on this one. It sounds like Amazon's team could learn a thing or two from eBay.