NZ Customs does not have a web site or email address.
                             
New Zealand Customs
Address: PO Box 2218
         Wellington
Phone:   04 473 6099
Fax:     04 473 7370

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B4.3.1  Duty Free allowance

Customs are generally more formal than in neighbouring Australia.

Total value of Duty Free goods can't exceed NZ$700

Duty Free quantities:
Alcohol;
 3 x 1.125l bottles of spirits
  - must declare 2 bottles
 4.5l of beer and/or wine
  - equivalent to 6 x 750ml bottles of wine or 1 doz cans of beer
Cigarettes;
 1 carton

For more information:
http://www.auckland-airport.co.nz/customs.html 
or ask at the duty free shop at the airport.  They are usually quite
up to date with the duty free allowances of each country.

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B4.3.2  Allowances for people relocating to NZ

You will be given an allowance of value of goods to be brought into NZ.  
So within the first 5 years ( I think) you can bring in quite a lot as
long as you are within the allowance without being taxed (customs duty) 
provided they are personal belongings for your use here.

Check the details with the NZ Embassy/Consulate in your country or
write to the NZ Customs.  You need to find out the allowance and ensure
you know the exact conditions pertaining to your circumstance.