Seems high to me... and I don't see anything unusual about the box either.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=330307072523
It looks like it is in pretty good condition, but I agree that 900 bucks plus shipping is a little too steep.
I was wondering the same thing myself. The machine doesn't have a Dimension board which is the usual reason for bidding one of these up.
Incidentally I see that the Dimension board computerpowwow was offering at $800 is attracting bids since it was relisted at $200...
I smell something suspicious, considering mono cubes with a soundbox and custom DB19/VGA cable sell for about $500-600....