G'day Dub
This may help...
https://www.ird.govt.nz/resources/6/e/6ec89340-3f88-446f-90da-f50aaae363c9/QB17008.pdf
As I mentioned, mine was acquired as a "store of wealth". I have kept all the necessary paperwork but have no intention of ever selling so I don't envisage any encounters with the IRD.
Of course, other punters will no doubt have their own purposes....