If you collected a insurance payment from the loss, it isn’t yours anymore, the amp belongs to the ins. Co.
if that is the case, just report it to them, they are the experts on recovering
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?