What Are The Odds Against This?

I have a teenage nephew who does a paper round. A few weeks ago he was out delivering his papers when he came across an unaccompanied tortoise, making its unhurried way along the road. He is a kind and helpful young man, so he picked up the tortoise, and approached a nearby policeman whom he asked what to do. The officer suggested that the lad took the creature home, and said that if it was not claimed within a number of weeks, he would be able to keep it. So home the tortoise went, and it now lives with my brother-in-law and his family.
Now as to the odds:- the chance of walking along in the suburbs of a large Midland city and finding a tortoise strolling along must be at least 5000 to 1. But the chance of finding a policeman nearby? More like 50000 to 1.