Land Transport Act 1998, ss 22(4), 22(5), 47
If an accident you’re involved in causes damage to a parked vehicle or other property, you must contact the owner within 48 hours (unless you can’t because you’re injured). You must tell the owner:
your name and address
where the accident happened
the damaged vehicle’s registration number (if the damage was to a vehicle).
You can be fined up to $5,000 if you don’t do this, unless you have a reasonable excuse.
If you can’t contact the owner, you must report the accident to the police no later than 60 hours after the accident (see above).