The deadline for renewing temporarily extended documents was 11.59pm on 10 October 2020. All temporary extensions have now ended.
No, you will need to have a current WoF/CoF/entry certification to purchase rego.
NZ Police and local government authorities have reinstated standard enforcement procedures from 11 October 2020. This means they have the discretion to issue fines or take further action when they find an expired WoF/CoF or rego on vehicles being used.