Earlier quoted context omitted.
That is extremely interesting. If it wasn't a legal authority that placed the device, then maybe the police can get involved and subpoena the sim card provider, ISP of whatever host the device connects to, etc.
What crime would they be investigating?
Good question. Maybe a statute against stalking would apply, or perhaps vandalism of a vehicle. These are not major offenses but they'd at least put the identity of the offender on record.