NZ is one of the stricter airlines when it comes to passport checks.
If even if you check-in online with NZ you still have to valid your passport at a kiosk or with a staff member at the airport. If you don’t they will page you at the gate before boarding to have your passport validated.
NZ also has a transit desk at AKL, that you can collect your boarding pass at if you want it before you for the gate. Go past the Mc Donlands in Departures, and it’s on the left hand side.