Actually, they could find the return flight but it won't be on the same record/booking (or PNR). So definitely bring a hard copy of your E TICKET confirmation: not just a flight booking, but proof that you've bought a ticket. It's very easy to book a flight and then cancel in moments later--an e-ticket shows you've paid for it. Should be good!
Originally Posted by
ChrisMwn
you wont be able to check in for your flight to NZ (visa free) , unless you can show evidence of your outward booking. if that's all with the same airline, then the checkin agent (and consequently INZ ) will be able to see that/ best to have your outward e-ticket with you when you go to check in for your flight to NZ.