I didn’t hear about the cannibalism, but there is a great documentary about the ignored earlier inhabitants of New Zealand called *Skeletons in the Cupboard* ([part 1](https://www.youtube.com/watch?v=rf_inGOubEg), [part 2](https://www.youtube.com/watch?v=g15ROUH3gAQ)). Summary: The earliest known inhabitants of those islands were ancient Aryans (white people).