No, no call from the police, but then again, our stuff is already far away! But its good that someone has been caught and stolen goods are being returned.
Re wiping the hard drive,  yes this would work, as would fitting a new hard drive, but they do not know a tracker has been installed, and they may be put off by the cost of a hard drive or having the knowledge of wiping the original.
As Nobrot says, they are thick and stupid,(and parentless) but are apparently very good at thieving.