Page 895 of Volume II in the footnotes, Bean writes about the rifles
I am quite quite sure that Bean was writing up the official history for both NZ and Australia. Bean was there in 1915. He landed 25 April, 1915. He was selected ahead of Rupert's father Keith
http://www.awm.gov.au/collection/records/awm38/3drl606/Bean was born at Bathurst NSW, in the era when there were very strong moves to form the SEVEN colonies into one, and in fact, at one stage in the 1890s New Zealand was more likely been part of the Federation ahead of Western Australia.
I would have loved the capital of the Federation to have been in New Zealand

PS, in the Index (I linked earlier) look under NZ
Would be nice to see something from the Kiwi perspective too.
Adding lots of info in Vol II re NZ Exped. Forces, so it is worthwhile looking for names of individual NZ personnel at Anzac in the Vol II index. I spotted that NZ's Major General Andrew Hamilton RUSSELL has lots of index references in Vol II. Each volume is hundreds and hundreds of pages with intimate details of battles. Thanks to Bean's writing, I know the exact time to the minute that one of my WWI cousins was KiA .... his War Service records are digitised thanks to RChatters in NZ.
Cheers, JM