ACC said the investigation was still continuing.
A source, however, told RNZ there had been a plethora of information provided to the investigation.
Meanwhile, there had been 30 ACC employees investigated for 36 information, privacy or data breaches in the last 12 months, ACC Minister Carmel Sepuloni said.
The figures were revealed in response to a parliamentary written question from National MP Melissa Lee.
Of the 36 incidents, 11 were still under active management, nine investigations resulted in warnings, one in a dismissal and two staff subject to an investigation subsequently resigned, a spokesperson for the ACC minister said.