Played for a sucker by your own brother? Sad. Was this "best friend" his dealer?

First, I don't believe that the car was stolen. I suspect that the "friend" sold it, either for export or to a chop shop for cash. If the "best friend" has in fact disappeared, it sounds like you didn't even bother to report this to the police. Did you? If not, why not? If so, why can't the police locate this "best friend" given that you know where your brother lives and you know where the "best friend" lived?