Whangarei Detective Senior Sergeant Dene Begbie said the type of firearm used or whether it was loaded could not be ascertained at this stage as the weapon was not located in the abandoned vehicle.
"For most businesses, Christmas is the busiest time of the year and it's about making sure they're conscious what steps they need to take and how to manage the transfer of cash.
Mr Begbie said in cases where people or businesses have been subjected to violence, such as an aggravated robbery, they needed to stay calm and to do what was asked. If a firearm was involved, he said people should treat the weapon as real and loaded.
"Take the descriptions of people, note the direction they head towards and, if they get into a vehicle, record the registration number and dial 111 as soon as they can."
Mr Begbie said the same advice given to businesses would apply to people carrying personal items such as purses and wallets while shopping and on their way to and from banks. Anyone with information about the robbery can call Whangarei CIB on 09 430 4500 or anonymously call Crimestoppers on 0800 555 111.