Wow, that sucks hard! I wonder if someone at the OTW could give any advice over what rights you (and the other ripped-off) authors have?

I'd definitely contact eBay directly and report the seller for listing items that are plagiarized and used without permission, if he/she doesn't respond to your email. I don't understand how anyone thinks they can get away with shenanigans like this these days - everyone who tries is always busted.

I hope everything works out! *hugs*