The data is collected from cameras attached to tow trucks. The people who source the data will come out and install it for free, and a laptop inside the cabin makes a noise and automatically prints out a repossession order if it finds a car on the repo list. They get a cut of the finders fee from the finance company who underwrote the delinquent car loan. (and from this article it sounds like they sell the data to law enforcement and lawyers now too)

I suspect thats why the hits he was able to find were from parking lots. Previous to the automated system repo guys would troll parking lots with a hot sheet of plate numbers looking for hits.