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This is how I did it a couple years ago:
http://www.usps.com/postalinspectors...dComplaint.htm
It took a few months but a postal investigator called or wrote me for further information and then sent a letter to the seller. About 2 weeks later I had my money back! I used a USPS money order and would suggest that be the form of payment to be used for any future mail transactions. I believe it is easier for the investigators to document.
good luck!
rick