Just a thought... draft out an email explaining your situation and send it to the last dozen or so eBayers who successfully received items from him/her. Good chance that one of them would have the sender's address if he/she was kosher when sending the goods.

Did ya hit eBay up for losing your dough?

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MY99 WRX sedan WRC blue Sold :(
MY99 WRX sedan Dark blue pearl :D
MY97 Liberty Outback Ltd Wagon
1990 Mk3 Supra turbo fully rebuilt 7M-GTE (Older son)
1991 Celica GT4 (Younger son)