Import Duty and Tax may be applicable to orders that are shipped from overseas where the item exceeds $1000.
Customs will contact customers if their item(s) are going to incur Import Duty Fee's. Customers will need to pay any Import Duties imposed to receive their items.
For some further detail please see https://www.customs.govt.nz/personal/send-and-receive-items/receive-items-from-overseas/