New Zealand does not have gun show or private sale exemptions, and the firearms license always required. If you lose it, you can kiss your firearms goodbye.
The US does not have a gun show exception. All dealers must do the same background check and paperwork that they do in stores, and the dealers will also do this for any individual buyer & seller who ask.
Some private sellers (a minority, in my experience) don't insist on having a dealer do the transfer, but that has nothing to do with where the sake takes place.
Some private sellers (a minority, in my experience) don't insist on having a dealer do the transfer, but that has nothing to do with where the sake takes place.