Amazing find! Reminds me, I once had my Pentax 645 kit and Nikon FE2 with 20/3.5 lens stolen from our house. We were upstairs getting our then-young daughter ready for bed, we had left the sliding door downstairs open as it was a warm evening. The thief must have simply run in and out with my gear. I did the usual things, contacted the police and insurance. Also checked all the local used camera shops and looked on the local auction site, but found nothing.
A month or two later I checked the auction site again, and there it was, my Pentax 645. I recognised it straight away due to the RRS quick release plates and the 58-67mm step-up ring 75mm lens (to match the filters on my other lenses). It was late on a Friday afternoon, the police office handling my case was already closed, and the auction finished in the weekend. I tried contacting the auction site, but they could only withdraw the auction only if the police contacted them. What should I do? I thought of bidding so it wouldn't be sold to someone else, but I was worried the seller might be the thief and recognise me, so let it go. The police managed to retrieve it in the end, hardly worse for its adventure. Still had the film in it - they obviously knew nothing about the camera, they had even accidentally taken a picture - I have a rather blurry picture of their mantlepiece! Still have the camera, but never saw the FE2 again.