Ebay selling my missing amplifier


8 months ago I sent an amplifier to europe for upgrades. The amp went missing and there were investigations that went unresolved. I happened to be searching on ebay and noticed the amp and when I magnified it Bingo the serial number was same. It is an ebay seller store that is listing it. Ebay has not yet responded after several attempts. What next?

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The end result is that it is owned by Cargo Largo. They purchase lost items through auction at a collection site. I have tried every angle to retrieve the amp. They all reply that it is under investigation. I even received a call from the Postal Inspecter who in essence said to let it go. I understand people  and a few attacking nerds wanted details but I never received anything definitive to post.