Whoa! This looks like a lynching (or a witch hunt).
Are we talking about this sale?:
http://www.head-fi.org/t/697071/fs-sennheiser-hd800-new-in-box-25383-unregistered-full-warranty-free-ship-pp
If so, I have a hunch those headphones were not purchased via the December 19th, $889.52 Amazon sale.
1) As seen in his photos, they are SN# 25383. My HD800, which was indeed purchased in that December 19th sale, have a SN# in the high 26,000's. It's possible that Amazon had inventory with so large a difference in serial numbers, but in my experience, they tend to buy stuff in lots, where serial numbers are similar at any given time.
2) That sale was very short-lived on the evening of the December 19th and mine weren't shipped until the 21st, not the 20th (which had me worried that I was going to get a "We regret to inform you..." letter from Amazon.) You can find my comments to that effect, earlier in this thread.
3) The seller didn't post any celebratory comments in this thread at the time of the sale, (perhaps to mask his intentions, but most people would want to pat themselves on the back, as I did.)
Food for thought, anyway.
I say, take the man at face value. He has 21 positive feedbacks with no negatives or neutrals and I see no real evidence of rule-breaking.