Hi des
Good to see another Kiwi on here. I see you are new to this site, it is an absolute wealth of knowledge for any questions you may have. Firstly the shell you have looks very similar to a german 88mm round i used to have. Do you have any history on this at all. I cant imagine that it was found in new zealand although i believe it was dug from somewhere. your item is missing compression bands tho.
The bullets are interesting me, where did you find these. Compare them to the pictures supplied. if they are the same then what you have found are bullets from a British MK1 enfield riflle used by the New Zealand constablary forces around the time of the early wars. The ones I have found have a number in the hollow of the bullet.
Anyway keep in touch and feel free to explore this very helpful site.