Hi! Welcome to the friendliest support group on the net!
The bad news is there's not much hope of ever seeing the empeg again. If you were really determined, you might like to have a look in the various bins and alleyways near where your car got ripped; as far as I've seen on this board thieves usually throw the empeg away because they can't recognise it and fence it easily. I've never heard of an empeg turning up on the grey market and being traced back to the owner, but I have heard of a few people who found the empeg dumped on the street or in a garbage can nearby.
Good luck with your enquiries - hopefully the police have recovered it. And if you should ever get another empeg, you'll know not to leave it in the car...
Good luck,
Paul