Hi engr.nazir
We applied from Ireland in the London Branch and from all we know a few things have change there recently, just administrative stuff but changed a few forms as well. You have the option to either collect your documents or have them sent by currier. TT Sevices New Zealand Visa Application Center was dealing with our visa and you can find the information about returning documents on their web page (not too easy to find, I admit).
https://www.ttsnzvisa.com/ServiceFee.aspx
Hope it helps!
Hanna