This is not an Auction site per-se. Which I mentioned in my first post (that you deleted). According to what I read the site donates items to convention charity auctions to help raise money for worthwhile causes. Here is the link to the direct myspace page hosting these items.
http://www.myspace.com/animecharityauctions
Go to the photos section to see the catalog. Although from what I read in the page it seems there is an even bigger catalog of items open to members who join the page, but it seems that you have to be convention staff to join the page.
At the bottom of the page it states; "If you are a fan looking to purchase some of the items that you see listed on the site, PLEASE DO NOT CONTACT US. These items are not for direct sale. They are solely for the benefit of the charity auctions that the anime conventions hold and the charitable organizations that they benefit. We will try to post information on this site as to which convention these items are being donated to, so that you can go to that convention to bid on the items you want."
So hopefully they will post where some of the autographed ABe items will go (including that original art piece).
Interestingly enough one of their blogs mentions a top ten highest selling items and 1 of them was a Texhnolyze flyer signed by ABe and the English cast for $455 and 2 of them were Haibane posters autographed by ABe and the English cast, one went for $500 and the other went for $2,300.
