Police have found a hat believed to have been worn by Lucas Cochrane when he was last seen.
It was found near a Whitianga waterway during the search for the missing teen on Wednesday.
The search will now focus around that area, police say.
Mr Cochrane was last seen at a function at Whitianga Fire Station late on Saturday night.
Police said on Tuesday they had no leads into his disappearance which they have been told is "completely out of character".
Divers have scoured waterways around the Coromandel town on the third day of searching.
Farms, small pockets of bush, roadways and waterways had been searched without success.
NZN / Newshub.