Ways not to lock your bike

Is the clearance rate of bike theft cases,
mentioned at any time in this lengthy video?
How many theft are never reported?
The majority of the theft are commited in heavily policed area,
with cams all over the place.

I'm not going to rewatch it, but if IRC one of the people who's bike is stolen(in second vid) says that he was told by police there was a 10% chance of his bike being recovered... Or something like that.