Man that sux,
I had a clone with a bad pin in the knee at the convention and had it replaced. they are very definite about not replacing parts after the convention ends so if you emailed them and asked it couldn't hurt but I wouldn't get my hopes up.

In this case, I'm assuming the eBay seller was selling "sealed as is".

I will have a couple sets of clones for sale once I get my act together and I think I'll be selling them under similar conditions simply because there's no way to tell through the bag and no way to get parts replaced under normal conditions.