Also got to notify in writing of your import. I enquired to clarify wether all parts imported required notification and this is the response I got
"You need to inform your Arms Officer or the Arms Act Service Delivery Group at
armsofficerpnhq@police.govt.nz of all firearms and/or parts imported, the permit they were imported on, and the information indicated on the letter you received with your permit."
This information included copies of customs signed permit and shipping invoice. Looks like they are making extra work for themselves and doubling up on customs signing items off.
Not a big deal just scan and email the required documents.
Worst part of importing at the moment is the backlog at customs (currently about 4 weeks) and wether NZ Post will deliver once released from customs (they told me no, I have to pick up or sort out some other freight provider).