A former information manager with Queensland's Crime and Misconduct Commission says he was not aware that Fitzgerald inquiry documents had been destroyed.
A parliamentary inquiry is investigating the release of sensitive material last year, and the destruction of up to 4,000 documents in 2007.
Greg Rigby retired in 2010 and has told the Parliamentary Crime and Misconduct Committee the shredded files may have been administrative records.
But he says they might not have been marked to distinguish between Fitzgerald inquiry material and documents from the former Criminal Justice Commission which were due for destruction.
"Was I made aware of the Fitzgerald inquiry material being destroyed? No I certainly wasn't," he said.
"Would officers destroying CJC files realise that they were destroying Fitzgerald records, if that's what they were?
"Unless there's some identification of it, I don't know that they would be aware."