European Discovery of New Zealand

Do you think the New Zealand government is capable of lying about early European exploration of NZ? I certainly do, and here's something to wet your appetite:

Te Papa, the National Museum of New Zealand, located in Wellington, has a Spanish helmet secreted away. No-one talks about it, no-one researches it, it just sits there.

This is the helmet and Te Papa's attempt to explain it away: https://collections.tepapa.govt.nz/object/131208?page=1&rtp=1&ros=1&asr=1&assoc=all&mb=c

The age of the helmet is consistent with the period when the Portuguese and the Spanish divided up the world between them. NZ sits within the Spanish part:

NZ Spanish Zone

Spanish explorer Álvaro de Mendaña de Neira was active in the Pacific at this time, and his discoveries included the Cook Islands. Now, Cook Islands speak a form of Maori language, so what do you bet that Alvaro took some Cook Islanders to NZ to visit their relatives...hmm? I'd say that's a solid bet, wouldn't you?

I've also found a Portuguese discovery, reproduced in the Portolan atlas 1547. Check out the following link: https://hdl.huntington.org/digital/collection/p15150coll7/id/53389

Page 23 of 103, Chart 1, f. 1v - remember, South is up on these maps. The north island of New Zealand is clearly drawn, called Illa do Magna right where it should be off the east coast of Australia. The port of Wellington can be seen at the bottom of the island, the very place where the Spanish helmet was found. So, this is strong circumstantial evidence that the Portuguese first found NZ, then the Spanish followed, and they both knew about Wellington harbour. Wouldn't the Spanish have checked out earlier maps?