The mystery of the woman known globally as "Sam" continues with the FBI saying a fingerprint check failed to identify her and they are not treating it as an active case.
The woman was found gravely ill with ovarian cancer on a street corner in Carlsbad, a seaside community near San Diego, in February and is suffering amnesia.
Despite not knowing her name and not carrying any form of identification, she says Perth, Bondi and Byron Bay are familiar to her.
A Facebook campaign has been launched by Sam and supporters, with the FBI acknowledging that social media will likely be the key to solving the mystery.
The Carlsbad Police Department is also not investigating the case.
"We are not doing any additional follow up on this," FBI special agent Darrell Foxworth told AAP on Tuesday.
"They're basically using social media in an effort to cast a wider net in an effort to identify who she is.
"Any of that information, feedback generated by social media is going back to her and the group of people she is working with.
"They will be looking at any of those responses from the social posts."
Sam remains classified as a missing person on the Interpol website.
A fingerprint check was expected to identify her as visitors entering the US are fingerprinted and Americans provide fingerprints for car licences.
"Fingerprints were taken and queried through a law enforcement database with negative results," Foxworth said.
Sam, who chose the name based on the biblical book of Samuel, says she was diagnosed with stage three ovarian cancer after authorities found her in February and she had a tumour the size of a volleyball removed.
She says the cancer has spread and fears she will die before knowing her identity.
"I can't remember anything," she told NBC.
"How I got here. I didn't have anything on me, no jewellery, no purse, nothing."
It was believed Sam could be Australian, although her accent sounds English.
She is believed to be about 50, has brown eyes, a chipped front tooth, stands 170cm tall, is right-handed and was blonde before her hair fell out after cancer treatment.
"Both Australia and Hawaii are extremely familiar to me," Sam wrote on the Facebook page.
"I remember having brekky almost every morning at the organic restaurant across from the ocean in Cottesloe Beach outside Perth, and dining for months at the restaurants in Byron Bay."
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