Lived in Auckland and Wellington and a local kiwi stacker
1) Yes there are bullion dealers that buyback at spot and have have traded with theses guys Regal Castings & Bullion based in Auckland for the past 20 years and
1)
https://www.regal.co.nz/bullion.php
Have lived in NZ all my life and this company have been my go to guys for the past 20 years and more when buying and selling bullion . A very reputable dealer in Auckland and have had no issues with them being the authorised Perth Mint dealership but do carry a limited stock in both silver and gold
NZ Mint also hold a Perth Mint dealership but have very limited stock as they are predominantly heavy with their own products
There are also a few others in Auckland as well to trade with but I find these guys easiest to deal with being a family run business with bullion only part of there trading
2) No active private market here in NZ with a handful of kiwis who are members of silverstackers and we are a fairly close community. I'm an active member of our local Trademe and have established contacts for that site when buying and selling bullion bars or coins both gold and silver
Check them out Trademe.co.nz and again no issues on this site either
3) Limited interest in Aussie silver coins but in saying that the odd ones do show up on Trademe and in particular the 1966 50c coins of which appears there is more interest in those
Some interest in the early NZ halfcrowns 2/6 with their silver content
Can chat further via a PM should you wish to converse and seek clarification