If you need to find the owner of a car, start with the number plates. there is an organization in australia called motor registrations where they keep records of all registered vehicles. if you know exactly when and how many times it's been spotted then that will narrow your search considerably!
for example, if i see a vehicle in front of my house at 12.30 but it wasn't there on tuesday at 14 o'clock, then i would just need to look at records for cars that were seen in front of my house on tuesday morning (or monday evening) about 4 hours after their initial sighting at 12.30am. if they belong to someone else who lives close by, i can speak to
how do i find out the owner of a car?
in order to get the owner of a car, you will need to go through the licensing department of the national motor vehicle registry.
if you know of a plate number and vehicle make, but not a state or province, many states have a department of motor vehicles with a website that can help.
alternatively, you can also call up your local police station and ask them if they have any records on file. if they do not have records from the specific time frame in question, then they should be able to provide contact information for officers in that area who deal more with traffic law enforcement on their beat. just explain that it is essential to get this owner information asap for an important reason- it may help solve a crime!