During a two week period police had 12 reports of thefts from cars parked on Abbey Caves Rd, near Whangarei.
Vehicles parked at Tutukaka, Matapouri and Whale Bay have also been targeted.
"We are really disappointed visitors to our district are targeted in this way - we hope by returning some of this property will go some way in repairing Northland's reputation with these visitors."
Police were photographing the property and anticipated they would load them on to their Northland Police Facebook page to help find more of the owners.
Mr Cleaver reiterated the safety message to hide all gear when leaving a vehicle and take all important documents such as passports
Terori Irihe, 23, from Otangarei, appeared in Whangarei District Court last Thursday on charges of using a document for a pecuniary advantage, receiving, and using a paywave card for pecuniary advantage.
He was remanded in custody and it was likely he would face more charges when he reappeared in court this week.
Further arrests were likely police said.