Transformer Cel Warning

Hello group. I don't look at the posts here too often so I don't know if it is appropriate to post here. However, I just noticed that a Transformer cel up on ebay looks to be an exact duplicate of a cel on my site.
http://www.ebay.com/itm/Optimus-Prime-Transformers-the-Movie-Animation-Cel-/260999212050?pt=LH_DefaultDomain_0&hash=item3cc4c3ec12

I don't know this seller or where the art he is selling came from so I have no way of knowing its authenticity. That is not my auction or art, I'm just sending out a note to the group as a heads up.

Seller's on Rubberslug

http://www.rubberslug.com/shop/item.aspx?i=4632

It appears to have a sequence number of A3. If it's a duplicate of yours, what is the sequence number on your cel? (It isn't mentioned on your RS site).

Mine is A3 as well.

Uh-oh, yeah that's not good. And the bidding is up there, now, too. Has anyone reported the listing to eBay? I'd love to see what the seller has to say...