Last year, when we drove from Calgary to Seattle, we had to stop at the Montana border crossing & I was really upset about being fingerprinted/photographed. UGH. Well, oddly enough, that never happened! I had my NZ passport but birthplace noted as Canada & was told I didn't have to go through all that crap! Ian did
Never confuse a US border guard. They couldn't understand why a Canadian was travelling on a NZ passport but lived in Australia

nor a NZ citizen living in Australia.
2-Always always always!!! note an item on your customs card when entering a country even if you're not sure! Never think the cool MAF dogs at the NZ airport will miss something.
I had a banana on the plane on my way back from (?) to Auckland but the dog still picked it up a day later..
A well vacuum packed & stickered pacakge of Bison Jerky will not make it through NZ customs

*sniff* My uncle had some packed up properly for me when i visited Canada a few years ago & thought it would be ok.. nope.. *sniff* I wanna some biiiison jeerrrrky...

*sniff*