Queensland's State Archives was not told in early 1990 that a law firm wanted to look through the evidence gathered through the Heiner Inquiry before Queensland's State Archives approved the documents' destruction.

Kenneth Littleboy, in 1990 a senior public servant, who was second in charge of the Queensland Cabinet office, told the Carmody Inquiry that he did not mention this fact in a letter he wrote to the Queensland State Archivist in February 1990.

Mr Littleboy agreed with counsel assisting the inquiry, Michael Copley, that the letter written to the then State Archivist was a gross over-simplification of the facts at the time.

"This archivist, she was misled by what was in this letter, wasn't she," Mr Copley said.

"She wasn't given all the facts," Mr Littleboy told the inquiry on Monday morning.

The letter contains a sentence that says "the notes are no longer required or pertinent to the public record."

However Mr Copley said documentation showed there had been "requests from solicitors" on behalf of certain staff to view the material.

"Now in your letter you did not tell her that solicitors wanted access to these records did you? How could you assert that."

Mr Littleboy said he could not recall.

The letter, drafted by Mr Littleboy, was signed by then cabinet secretary Stuart Tait.

Mr Copley said the letter was a gross oversimplification of the position at the time.

"Material was apparently being sought by solicitors," Mr Copley asked Mr Littleboy.

"It would be fair and in the interests of the new government that was going to be all open and accountable, wouldn't it?"

Mr Littleboy said someone may have asked him not to include the information in the letter.

"I drafted it, so it can only have been Stuart."

Mr Littleboy said he regarded himself as an ethical public servant, who would have left "solicitors interest" in the Heiner material out of the letter only on advice.

Mr Copley said in summary that the Queensland State Archivist was not made aware that solicitors were interested in viewing the Heiner evidence before the Queensland State Archives approved their destruction.

"No," Mr Littleboy said.

"And she should have been, shouldn't she," Mr Copley asked.

"Yes," Mr Littleboy said.

Former John Oxley Youth Centre manager, Peter Coyne, told the hearings before Christmas that he had asked a law firm to get access to the Heiner documents.

The Carmody Inquiry is investigating the reasons why the evidence gathered by former magistrate Noel Heiner was ultimately shredded in March 1990.

Meanwhile, the woman who helped shred the Heiner documents 23 years ago said the action was unusual.

Queensland State Archives officer Katherine McGuckin was closely questioned after she and a senior officer from the Families Department in March 1990 put a sealed box of cassette tapes and transcripts through a shredder in March 1990.

She said she wrote a memorandum the next day explaining her concerns at her involvement in the destruction of the documents.

"I wasn't uneasy about it, but it was unusual," Ms McGuckin said.

She told the inquiry that she was acting in the position at the time.

The evidence gathered during the Heiner investigation into the John Oxley Youth Centre at Wacol were shredded by Ms McGuckin and Trevor Walsh from the Families Department at the Families Department offices on March 23, 1990.

Ms McGuckin said the decision to destroy the documents had already been made by Cabinet.

However she disagreed with a subsequent memo from Mr Walsh that she alone had destroyed the documents in his presence.

She said she and Mr Walsh had both shredded the documents.

Also this morning, Mr Littleboy told of carrying a sealed "rattly box" of evidence from his office in the Executive Building down George Street to be shredded by Ms McGuckin and Mr Walsh.

He was also closely questioned by Michael Copley, Counsel Assisting Inquiry, about the source of memo to that senior Families Department officer, Trevor Walsh on January 19, 1990 about the Heiner inquiry.

Meanwhile a senior Families Department public servant, Myolene Carrick, also said that she found it "highly unusual" to be asked to sign a Cabinet Submission on February 13, 1990, for then director-general Ruth Matchett.

"I signed because I was asked to," Ms Carrick told the inquiry.

She said she was "fairly certain" she was asked to sign the submission by Mr Walsh, who worked in Ms Matchett's office.

Ms Carrick said it was unusual for her to sign the submission because she did not deal with youth centres as part of her job.

She believed Ms Matchett was not available to sign the submission.

"I would only have signed it if I had been asked to sign it because I had no knowledge of it whatsoever."

She said she would have questioned Mr Walsh why she was being asked to sign the submission.

Timothy Carmody was appointed in July 2012 to head the Queensland Child Protection Commission of Inquiry into the system, including revisiting the Heiner Affair.

It is the long-running controversy surrounding the Goss cabinet's 1990 shredding of documents relating to child abuse - including the rape of a 14-year-old girl - after it aborted an inquiry into the former John Oxley Youth Detention Centre.

What is the Heiner affair?