Consider yourself lucky. The NZ CAA (equivalent to the FAA in the US) has fined tourists two have posted YouTube videos of illegal drone flights in NZ. (Last year, a British YouTuber got fined after making a flight (similar to yours) in downtown Auckland.) Once you've left NZ, you're probably OK. But it's still not a good idea.
Realistically folks, the FBI still hasn't been able to get NZ to extradite the pirate Kim Dot Com (biggest fish in the sea) so I'm going to laugh really hard if them NZ folks think they can fine me after I'm already back state side.
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