This information has been provided by the New Zealand Customs Service. A link is provided below
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You can bring human ashes into New Zealand with you, but you must declare them. We recommend that you have a copy of the person’s death or cremation certificate with you.
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If you send human ashes by post, you must declare on the postal declaration that the package contains human ashes. You must include a copy of the death or cremation certificate in the package.
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For further information please click on the following link https://www.customs.govt.nz/personal/prohibited-and-restricted-items/