Fire and Emergency Services spokesman Paul Radden said a unit was called out to a fire alarm sounding at the NZ Post mail area.
A NZ Post spokeswoman said they were aware of the incident.
Matches and cigarette lighters are listed as prohibited items to send according to the NZ Post website.
"Some items are prohibited as they pose a risk to the safety and security of our staff, for example ammunition and fireworks," the spokeswoman said.
"Others are also prohibited as they are a high risk for us to carry, cash for example."
All NZ Post customers are encouraged to check the website to find out more and if an item is safe to send.