Is it the Dartzeel being sold by CargoLargo for $14,999? I rode up the chairlift in Utah couple years ago with a guy who ran eBay’s fraud division. They have a whole team based in Salt Lake dealing with fraud. Counterfeiting, fake offers, stolen goods for sale etc. IF you could ever track that team down by phone you might be able to make some progress.
Have you filed insurance claim on your homeowners policy for stolen goods? Insurance investigator would track it down and bust the culprit since you’ve located the property.
Was it sent back to Dartzeel in Geneva for repair? Sounds like lifted from their shop. Have you contacted the repair shop again? Hey dude I found my f******* amp!! Stolen from your shop! I’m not a conspiracy theorist but maybe they were in on it.