Forensic investigators have combed Hamilton City Council's security systems after a sweep of the chief executive's office for bugs in the hunt for the source of damaging leaks.
CEO Barry Harris commissioned investigators from PricewaterhouseCoopers last year after confidential information, including a V8s audit report that showed staff had covered up true costs, was leaked to media.
The move followed a sweep of Mr Harris' office just months after he started as chief executive in April last year by corporate espionage experts looking for electronic listening devices.
Mr Harris confirmed he hired two forensic investigators to review information management and security processes to ensure confidential information was being managed properly.
The $15,000 review was paid for out of the chief executive's office budget.