There's no evidence because any skeletons or bones have to be handed over to the local 'iwi' for cultural reasons. And any land that may contain remnants of any civilization other than maori is slapped with a bullsh*t 'tapu' preventing access. What a shame. One day the bones will show the maoris up for who they really are - not Tangata whenua.
I live in New Zealand. It's all in plain sight, and obvious that a far superior race than the maoris occupied this land well before them. Most proof still lies under ash from the great Taupo explosion.
There are too many maori land claims and 100's of millions of dollars of payouts at stake here for any real, unbiased archaeological work to be allowed to be undertaken. The truth will come out.
Something is not right. This message is just to keep things from messing up down the road