It is my understanding that only the 5 GH/s Jalapeno (now called the "BitForce 5 GH/s SC") was the only model shipped and that was to fulfill the June 2012 orders and some to bloggers/testers. I could not even find a post mentioning a BFL 50GH/s miner being sent to anyone to inspect/test/write about.
Here is a link to the BFL shipping posts.
To me, unless there is some supporting evidence, this auction poster called "jellyfish" is probably trying to rip someone off.
His other auctions are for a gold bar and for 50 bitcoins which should also be investigated.
Looks like a ripoff. I certainly wouldn't bid on it. He is probably trying to take advantage of non-reversible crypto transactions.