You might have a case for fraud, and potentially a claim under 93a in Massachusetts, but the value of your item and any damages is likely low and thus an attorney would probably be more than any damages you could recover. It would seem best to keep going through Ebay's claim processing.
Kyle Piro is a licensed attorney in Massachusetts. All answers are based on Massachusetts law and should not be construed as legal advice. No attorney-client relationship is formed by Attorney Piro answering your question. It is advisable to consult with an attorney about your personal legal concerns.