Lawyer Zali Burrows told the NSW District Court she was no longer acting for Mehajer by March 2020, when an affidavit was filed with the Federal Court seeking to have the appointed trustee of Mehajer's bankrupt estate replaced, purportedly witnessed by her in the Sydney CBD.
"Is that your signature?" crown prosecutor Daniel Boyle asked multiple times regarding multiple signatures on Tuesday.
"No," Ms Burrows answered each time.
Mehajer's sister Zenha Osman answered the same about a statutory declaration, purportedly written and signed by her and witnessed by Ms Burrows, seeking to have $6530 cash seized at the bankrupt Mehajer's Kirribilli home returned.
Mehajer was a former deputy mayor of the since-merged Auburn council in Sydney's west, rising to notoriety when his lavish 2015 wedding celebrations shut down a street.
He has pleaded not guilty to four fraud offences, alleging he made and used false documents to obtain a financial advantage.
Ms Osman said she did not sign the documents and was not aware the statutory declaration had been made until "probably two weeks ago".
"Not until the police showed me," she said on Tuesday.
Ms Burrows said she was in a trial at Parramatta when the affidavit was purportedly witnessed by her in the Sydney CBD.
Mehajer's barrister Ben Hart clarified court adjourned early that day and suggested Ms Burrows had simply forgotten she signed the documents due to a heavy workload and the passage of time.
"No, because the matter was raised with me quite early," Ms Burrows said, referring to a phone call she received from insolvency expert Ragu Nith, who referred the matter to police when Ms Burrows denied signing the papers.
Ms Osman had given authorisation for Mehajer to talk to Mr Nith on her behalf relating to money sourced from a company she was the director of, seized by police at his home, because she was too busy with her children, she said.
Mehajer is accused of forging a statutory declaration from her.
"The funds taken are urgently required to meet my overwhelming bills," the declaration claimed.
"Obviously you trust your brother to do the right thing," Ms Osman said on Tuesday, conceding it was "probably my fault too" for not paying enough attention.
The Crown concluded its case against Mehajer following evidence from Ms Burrows and Ms Osman.
Mehajer is giving evidence as the trial continues.
He said he "most certainly" did sign his own signature on the documents but did not forge Ms Burrows' or Ms Osman's.
Mehajer said he asked a third party to assist preparing the document, and was not aware that she had not signed it.
"I became aware later," Mehajer told the court as his sister watched on from the public gallery following her evidence.
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