FYI, an update: a couple of weeks ago I escalated the case with ebay and got a refund of the amount paid and today I received a further refund of the UPS return postage, so I'm at net zero.
OTOH, I've not spent much time with the rack and the other power-amp in it, plus I've gone and broken a finger (luckily only my right-hand pinky, but it's still a niggle when I play).
On a plus side, I did pick up a rather nice Tokai Strat a couple of weeks ago, which I've had my eye on for a few years, so mustn't grumble...