Whether or not this dev kit is actually legitimate is still up in the air...
A few weeks ago, someone on the game dev forum AssemblerGames claimed to be in ownership of a Durango (the codename for the next-gen Xbox) developer kit and was selling it for $10,000. According to Digital Foundry's sources, the pictures that the individual, going by the handle "DaE", posted of developer kit were genuine.
DaE was banned from AssemblerGames after it was revealed that his sales posting had been a prank.
Strangely enough, a Xbox Durango dev kit surfaced on eBay with the seller listed as superdae. It doesn't take a huge mental leap to connect that handle with "DaE" from AssemblerGames. The auction is scant on details, aside from the listing of the condition of the Durango dev kit as "used."
The bidding ended yesterday, closing at $20,100, but the lack of details provided in the listing makes one wonder about the authenticity of the sale. The selling of dev kits obviously puts an individual in a legal minefield with Microsoft, but the company's yet to give any comments regarding the issue. Perhaps they're investigating the authenticity of the kit while prepping its lawyers to dish out a good legal beating?