I just had a similar situation with feedback, but I was the buyer.
Long story short, bought something "like new", but $60 worth of parts were missing. The seller told me it was my issue because I didn't ask if all the parts were there. Obviously something in "like new" condition should have all the included parts. Bad news for me, shipping cost me $80.
Paypal settled the dispute with the decision that I mail back for a refund. Well, I'm not spending $80 to mail back something missing $60 worth of parts, so I declined paypals offer (which i'm still pretty unhappy with Paypal's protection of the buyer).
So, this guy leaves me negative feedback saying I tried to extort money from him and froze his account for a month.
I sent an email to Ebay and within 24 hours, the feedback was removed.