I was trying to chase up the chassis for a sandman shell I've got. I had the number off the tags and put in a freedom of info form to rms NSW asking for all past and current rego papers for that chassis. They don't just give them out based on privacy but said they would pass my request and number to all previous owners to get their consent. No consent was forthcoming, but I actually got a call from the original owner which was great, but didn't lead me to the chassis itself. The biggest lead I got was the name of the town that the ute that now sits on the chassis was last registered to.