Sorry to hear about your motorized bicycle.
I had a non-mb stolen years ago while i was at school and while I was still on the bike lol. It was found and recovered, then shown to me. But it was in pieces and stickers/ serial numbers were scratched off like the people had a bicycle chop shop going on lol. The guy whole stole the bike from me was also caught and had to pay for a new bike because my bike was unrideable. So in the end I came out with a new bike
It was later stolen from the back of my house and with no witnesses the bike was gone forever.