A recording of a meeting between ACC management and whistle-blower Bronwyn Pullar that reportedly clears Ms Pullar of threatening the corporation has been questioned by Prime Minister John Key.
Ms Pullar, a former National Party official and an ACC claimant, was last year mistakenly sent a spreadsheet by ACC that contained personal details about 6500 other claimants, including sexual abuse victims.
She reported the privacy breach in a meeting with ACC managers in December, and went public with the information earlier this year.
Following media reports about the case, ACC referred the incident to police.
In a report to Minister Judith Collins, ACC said that in the December meeting, Ms Pullar had threatened to go public with the breach if the corporation did not give her a "guaranteed benefit payment for two years''.