The jersey:

http://www.historicauctions.com/inde...uctionid=31667

Hideki Matsui 2005 Game Used Jersey
Auction Number: 31667
Current Bid: $6,019.65
Start Time: Nov 18, 2005 10:00:00 AM
End Time: Jan 2, 2006 12:34:43 PM
Number of Bids: 8
LOA - Lou Lampson

The description makes no mention of any Steiner documentation, certificate, or hologram. Images of the jersey don't seem to show any Steiner hologram.

The Steiner response:
"...That jersey, in all likelihood, is NOT what it is being represented as. Yankees-Steiner Collectibles is the ONLY source for authentic game used and game issued Yankees jerseys. We had possession of the only 2005 Hideki Matsui game used jerseys. If the jersey does not come with the Yankees-Steiner hologram or letter of authenticity, then in all likelihood it is not real. .... And one other note, if the person who bought the jersey would like to find out if it is real or not, it can be sent in to Yankees-Steiner, where we will be able to locate the invisible coding that goes into each game used Yankees jersey."

Rudy.