Senior Sergeant John Fagan said the 2011 Nissan NV200 light van, with the registration plate KPN414, was driven off towards Dargaville on SH12.
The vehicle was reported stolen from the Dargaville Medical Centre earlier in the morning.
Fagan said there were reports of the vehicle being spotted in the Aranga area south of the Waipoua Forest after the ram raid.
Officers in the area have been carrying out enquiries to locate the vehicle and its occupants.
"We encourage people in the area to report any suspicious activity straight away to police," Senior Sergeant John Fagan said.
"Obviously this has caused considerable damage to the store, and police would like to hear from any person who has information regarding this incident."
Anyone with information about the ram raid can contact their nearest police station or anonymously on Crimestoppers 0800 555 111.