Tasmanian Liberal Party state director Sam McQuestin will not resign over the handling of former director Damien Mantach's resignation in 2008.

Mr Mantach was forced to resign after using a party credit card for $48,000 worth of personal expenses.

He repaid the money but it did not appear on the party's annual return.

He is now being investigated in a separate matter for allegedly stealing $1.5 million from the party's Victorian branch between 2010 and 2014.

Mr McQuestin broke his silence on the Tasmanian matter this afternoon, and said that because funds were repaid and no loss was incurred, the matter was considered closed.

But Mr McQuestin yesterday asked the Australian Electoral Commission to amend the party's disclosure return for the 2007-08 financial year and attribute more than $42,000 of receipts to Mr Mantach.

"The disclosure unit of the Australian Electoral Commission acknowledges and agrees with the approach that we have taken in this matter, and it is not unusual for political parties to file amendments to their disclosure," he said.

The paperwork shows three sums of more than $10,000 each from Mr Mantach.

In a statement earlier today, Mr McQuestin referred to the matter as "an administrative oversight".

The ABC has also sought comment from several other party officials who were working for the organisational wing at the time.

Opposition Leader Bryan Green asked Tasmania Police to investigate the circumstances surrounding Mr Mantach's resignation.

"It would never have come to light had Mr Mantach not have been alleged to have stolen money in Victoria," he said.

In Parliament this week, Mr Green repeatedly questioned Premier Will Hodgman about his knowledge of the matter and also queried the thoroughness of the party's internal investigation into Mr Mantach.

Mr Green wants to know what the $48,000 was spent on, and over what period the money was spent.

Mr Green argued that any payments over $10,000 should have been declared publicly under the electoral act.

He asked the Premier in Question Time if the executive attempted to cover up the Mantach affair by failing to lodge a proper return.

Mr Hodgman was one of a small number of senior Liberal Party members informed about the matter at the time.

Senior Liberal Eric Abetz breaks silence

On Thursday, Tasmanian Liberal Senator Eric Abetz broke his silence on the issue, releasing a statement saying that when the former state president Dale Archer brought the matter to his attention on March 5, 2008 "no advice was sought or offered" and "no sum of money was mentioned".

"This is not surprising, given that an investigation was still to occur," the statement said.

Mr Archer claims he gave the federal director Brian Loughnane the full details of Mr Mantach's resignation on March 6, only one day after telling Senator Abetz the investigation was still to occur.

In Parliament, the opposition leader accused the Liberal Party of a cover-up, saying Mr Archer could not have conducted an investigation in just one day.

"The very next day, the investigation had been completed, the amount of money had been determined," Mr Green said.

"He [Mantach] had been asked to resign, he had resigned. Nobody believes that."

"In one day, to say that the investigation could take place to the extent that he's made a file note and rung his Victorian counterpart to say that there is a problem? I don't believe so."

In his statement, Senator Abetz said the resignation of Mr Mantach was not finalised until almost two weeks later.

"There was a State Executive meeting on 15 March where the resignation of the State Director was reported," he said.

"I was interstate and was an apology for that meeting."

Tasmania Police has confirmed it is looking into the matter.

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