the funny part is, 90% of the comments are focused on teaching this guy vyrus a lesson. I think we should either present a reasonable justified solution first rather than coming up with extreme solutions.
Firstly, the poster should give us details as to how the engine exchange was made and what documents were exchanged at the time the engine exchange was made.
Secondly, I have seen some gentlemen here advising to help out on this situation who know Vyrus personally. That would be the only way out. And I personally feel this guy vyrus is a 20 year old kid who is in some state of Trauma and is scared. You people should get in touch with his parents. Im pretty sure they might help out.
Thirdly, if Vyrus believes that he should not give him the official docs and the TIME IS NOT RIGHT YET, i think you should clarify why you don't wish to do that kid because even a simple call by someone and giving your home address and the posters' home address reporting the car's engine is stolen could cause big issue for a while. Your car will land up in lock up for a while although you could claim it back if u have the engine's real receipt, but with sources in Police, the guy who makes that call can get the car's accessories and parts stripped off. So kid, be reasonable while saying what you are saying or explain why you do not wish to make the arrangement and what would be the best solution according to your observation.