Thanks for all the condolences from the members on this board.
Special thanks to all the police officers on this board.
At this point I do believe I have sufficient background info (including his leased m3).
Although possibly futile, I am making final attempts to reach a resolution with the seller, simply based on his age.
I can understand young people makes careless mistakes. I hope he would take responsibility for his own action and not elevate this further to make this mistake incorrectable.