Agree with just about all the above comments. With one caveat: If you don't know where he is, and/or where the vehicle is, then its hard to do anything about it other than try to get the police interested - and I think we all know how problematic that is these days, given their workload and priorites. After all, has a crime actually been committed?
I did see a disassembled chassis about ten years ago, and received assurances about its progress. But then he moved again. When he again went dark on me I drove over to see an empty workshop and no-one knew where he had gone and I was once again hunting for him. I had no luck till people in the Series One Club helped. However, sod's law threw up some fairly serious obstacles to following up on that info: parent dying, getting covid etc. So, after a series of emails and messages went unanswered I appealed to this forum and threatened to go to the police. And there you have it - warts and all (well almost!).
Most people tend to trust others till the bitter end - and there are those who take advantage of that fact, stretching the "elastic" to the breaking point.
I have no idea what Andrew Cameron's intent was, or is. I hope this will end well. But as mentioned above, I will update this forum on the end-story as a courtesy to those who have posted expressions of concern and support - for which I am very grateful.