Hi Sharon,
There are two resources that might be useful to you. The first is a microfilm held by Archives New Zealand in their Wellington office:
Police Staff Register with Nominal Index. Book 1. 1859-1927. Microfilm 3348.
I mention this film because while outside your timeframe there may be other films for later years. This film (and presumably others if they exist) doesn't appear on Archway, Archives New Zealand's search portal because permission is required from NZ Police to view it, due to privacy reasons.
The second item is a book by R. T. Hermans, entitled
Capital Coppers (1985).p.31.
Unfortunately I am not able to look for these items for you but others here might be able to.
Modified to add: Anyone able to look for an Archives file should speak to an Archivist, firstly to see if a file exists and secondly, discover how to access the file.Spades