My cousin's laptop has been stolen from the bus he was traveling on. It was a m series Macbook Air. What can he do now and what's the best approach to get it back? Need guidance from a victim's real experience.

My cousin's laptop has been stolen from the bus he was traveling on. It was a m series Macbook Air. What can he do now and what's the best approach to get it back? Need guidance from a victim's real experience.