But after a five-month police inquiry, Australian police say they cannot find a case against him.
"The matter was evaluated and no Commonwealth offences were identified," a federal police spokeswoman said.
However, the Australian police had "provided advice" to New Zealand police and would give assistance as required.
Shirtcliff, 67, hit the headlines last year when he initially refused to give evidence at the royal commission of inquiry into the collapse of the CTV building, which killed 115 people, in the February 22, 2011, earthquake.
He finally appeared after it emerged he was jailed in 2005 for a GST fraud in which he falsified the books of a failing business he sold to a Queenstown couple.
During the royal commission hearing, he was accused by commission lawyers of distancing himself from responsibility after he claimed limited involvement in the building's construction, despite being construction manager.
Asked why he lived in Australia under the Fisher identity, he said it was because of "family issues" going back 40 years. Since giving evidence, he has been accused of stealing the identity of William Fisher, with whom he worked in South Africa, and faking an engineering degree.
It is alleged the fake degree from Sheffield University gave him entry to a master's programme at the University of New South Wales in 1971, which led to his master of engineering science in highway engineering.
Last November, the Australian university stripped him of his degree.
Shirtcliff has continually denied any wrongdoing, mainly through his Brisbane lawyer David Tucker.
When asked if Mr Shirtcliff would like to comment on the news, a woman at his Brisbane home last night said "no he wouldn't" before hanging up the phone.
A spokesman for New Zealand police yesterday said their investigation remained open.