same thing happened to me in `87. I had my GS BMW R80 enduro knicked outside my newly acquired flat in Brum, within 3 weeks of moving in. Coppers said it was found in Blackpool, and was a write off. I didnt question it at the time, but just claimed the insurance money, this was the same ammount which i paid for it 2nd hand.
Anyway, found out several months later, that a large police headquarters just happened to be in blackpool. What were the cops riding at the time? Bm´s,
i rest my case.