Although I got 4/4, I believe New Zealand should not be on the list. New Zealand's cook islands, manihiki and penrhyn islands are well above the line of Capricorn.
Interesting point! The Cook Islands are actually neither a territory or dependency of New Zealand - they are a country, in free association with New Zealand, the same status that the Marshall Islands and Palau have with the United States. However, there is one external territory of NZ which is north of the Tropic of Capricorn - Tokelau. We'll add a note to the instructions.