A scene examination had been completed and the vehicle was undergoing a forensic examination.
A post-mortem was being undertaken Thursday afternoon to establish the cause of death and to formally identify the victim.
Police hoped to release the name of the victim tomorrow, once all next-of-kin have been notified.
Detective Inspector Kevin Burke said police have received calls from the public with information.
"We really appreciate the community support," he said.
"We continue to ask anyone with information to come forward and assist police with our enquiries.
"I also want to remind the community that we have no information to suggest that there is any on-going risk to members of the public.
"The investigation team will continue to work on this until we have identified and located the person or persons responsible for this crime," Mr Burke. said
Information can be passed to the Whangarei Police Station on 09 430 4500 or by contacting Crimestoppers anonymously on 0800 555 111.