Hello again.
I would recommend contacting the Auckland library. I find their very extensive family history holdings rather difficult to navigate, and search on line. Not so user friendly for myself, but on a good day I can even find my way back to digital copies of their original card indexes, with their hand written notations, that I thumbed through all those years ago. All very interesting stuff if you have the time, and patience, to navigate your way through. Like with the NZ Archives research that I'm doing at the moment, the more homework you can do on line, assists for when you are at the archive. Surprising how fast time flies, especially if you are also needing counter staff assistance on the day.
Alan.