Both the All Blacks and betting syndicates have been ruled out as perpetrators of the bugging at the All Blacks' Sydney hotel in August.
The Daily Telegraph reports that rumours the All Blacks planted the device themselves in a prank gone wrong is false, and that the listening device found in a team meeting room at the Intercontinental Hotel in Double Bay was live.
Investigations started on August 20 after the find became public through a story in the New Zealand Herald, and investigators have been meticulously preparing a report after speaking to a number of people.
Wallabies coach Michael Cheika revealed last weekend that police officers had turned up to the ARU's headquarters in St Leonard's and questioned management about the discovery of the device before the first Bledisloe Cup Test.
Cheika is incensed at the implication some have made that the Wallabies were behind the planting of the device.