Ebay selling my missing amplifier

Now that we have some data, you should have your attorney contact the appropriate people at UPS. It isnt your responsibility to track down/retrieve the goods. Since you have an open claim, you only need to prove that they most likely sold your goods to the third party. Threaten to file suit in your home venue for the full amount asserting theft by UPS. At what amount did your insure? 8 months is along time for an open claim. You are more patient than I.

Sheesh, why are so many audiophiliacs such low life's? People stay out of trouble by minding their own business,

@wesheadley 

It is extremely rare for FedEx or UPS to lose a shipment like this -- especially if was insured.

@ghasley 

here’s the way it works. If you ship something and say have $1,000 insurance from Fedex and then they lose it, they pay off. 

Total BS. No it is not, and no they do not.

No they don't. I shipped a speaker by FedEx and it disappeared. They contract third party companies to make deliveries and the only "proof of delivery" is a piece of paper that says Delivered. No accountability, no investigation, no payout. 

The paper said Delivered. End of claim. 

eBay has a security department that can be reached by the sitemap. In the past, at least, they have had attorneys, former prosecutors with experience, on staff. You would need at least the listing number of the article you believe to have been your stolen property and probably any identifying information to verify your claim: insurance claim information, police report and any documents pertaining to the item in question (warranty papers, original boxes with serial numbers, etc.) If you were paid for your losses, your insurance carrier may have an interest, if you suffered partial loss (insurance deductible, e.g.) you obviously have an interest as well.  If you know where the article is being sold from and are able to contact local authorities there, that may be another option.