Ah, you’re right. The reporting[0] at the time seemed to imply that a handful of FBI agents were present among the NZ officers during what was reported to be a "US-led raid". FBI agents evidently[1] left the country with physical evidence from the raid that NZ was supposed to keep custody of.
So it was NZ choosing to violate it's own laws under pressure, just not quite as dramatically as reported?
Doesn't NZ have laws about not having a death penalty, and therefore it is impossible to extradite anyone that has 0.01% chance to get the death penalty?
0: https://www.rnz.co.nz/news/national/96384/fbi-agents-continu...
1: https://www.odt.co.nz/news/national/fbi-committed-illegal-ac...