the 6000 i got off ebay for $412 just showed up, so apparently at least some of the ~$400 ones on ebay are legit.
From whom did you get it? I won a bid on one on Sunday from shanetso, who seems a reputable seller. I would get some peace of mind if got it from him...
Thing is I was also going to get one from Amazon the last night the $378 ones were on sale, but I'm in Guatemala Central America. First I had to get the physical address of a friend who lives in the US so I left the purchase pending until the next morning but then they were gone! Then I was tempted to get one from jpettins. Thanks God I did not! I checked his background and he had been selling ET novels for $0.01 to build up his rating! So I did not trust him.
Wanting a Zaurus so badly (I have been using Linux since 1993) but not happy to pay $700 for a Zaurus I just came to the ZUG on December 1st, when Amazon had sold their last one, jpettins was doing his thing and OZ finally supported the 6k. I then decided to go the ebay route but it is my first purchase there. Being abroad makes you think not twice but many times to go on a bid.
I hope my 6k deal comes to an end nicely as yours did.
PD: I got mine for $395 on a slow Sunday bid. All the other I have tracked have been sold for $405, I always losing them for 5 to 10 bucks.