Six members from the Police National Dive Squad and four members from the Invercargill Search and Rescue team took part in the search operation on Tuesday and Wednesday.
During the search divers covered a large area of the lake, however due to the depth of the lake the team could not explore further.
The boat was first reported with two people aboard on Lake Hauroko on May 31 and a woman's body was found the next day, but a man remains missing.
Sergeant Ian Martin, of Invercargill police, said the items were found close to where the woman's body was found.
Police said they will be reviewing their options before resuming the search.