Perhaps my suspicion the authorities would be ineffective in using the stolen sonos data to track criminals is wrong. As a simple user, there is much about wifi/lan I'm unclear about. Unless police dedicate personal to this type of stolen mac genre it seems it would be impossible for most departments to solve anything. Nice if I'm wrong which is quite the everyday thing.
The police won't do anything except relay the information to Sonos, and any follow up investigation once the unit is tracked. The only reason Sonos requires the police involvement is to make sure the unit is actually stolen, and to prevent any vigilantism from taking place.