It is reportable:
http://pages.ebay.com/help/policies/...sclaimers.html
From the link above:
Sellers are not allowed to:
List items that aren't authentic
List items if they're not sure if they are authentic
In addition, sellers can't disclaim authenticity of their item by stating, for example:
"I cannot guarantee the authenticity of this item, so please bid accordingly."
"Vintage handbag Chanel???"
"Looks like this could be a Louis Vuitton bag"
"I believe this is painted by Degas, but I can’t be sure."
"I got this from an estate sale, so I have no idea if it’s real or not."
"The autograph looks real to me."
"I’m no expert, so look at the pictures and decide for yourself if it’s real."