The problem in larger blocks is identifying who actually owns the offending vehicle, and/or which unit it relates to.
OCs can’t just go to a police station or the RMS and ask who the owner is. Quite often the “owner” has a different registered address anyway. The only way is to be around when the vehicle is driven in to the building, and then try and discretely follow the offender to his/her front door. Who is going to do this?
Leaving notes doesn’t have much effect, the owners know they can’t easily be traced. I imagine an NTC would need a name to be valid ?