Someone knows what happened to missing Melbourne schoolgirl Siriyakorn "Bung" Siriboon and her stepfather thinks it is time they stood up.
People just don't disappear, Fred Pattison told reporters on the fifth anniversary of his stepdaughter's disappearance as police revealed a new possible sighting involving a white Holden.
"Somebody's got to have the conscience to come forward and tell us what's going on," Mr Pattison said on Thursday.
Five years ago the 13-year-old dressed in her uniform and left home about 8.30am to walk to school in Melbourne's outer east.
Bung never made it. Not knowing what happened has taken an agonising toll on her family.
Her mother, Vanidda, has moved back to Thailand with her eldest daughter because she was unable to cope with constant reminders of her missing daughter.
"I tried to bring my family here for a better life and then something like this happens - it's not right," Mr Pattison said.
Victoria Police have previously released information about two possible sightings of Bung on the morning she vanished - but neither have been confirmed.
On Thursday, Detective Inspector Michael Hughes said a third possible sighting on June 2, 2011, was of a white station wagon on Napoleon Road in Rowville between 8.45-9am.
It's believed an Asian female teenager was sitting in the front seat.
Police were told this two years ago but only revealed it publicly on Thursday.
"Everything else pointed to another sighting of Bung ... You get to a stage where you say 'What else haven't we looked at?'," Det Insp Hughes said.
"This was always there, it was always being worked on, but now we think it is time to go to the public and say 'Can you help us?'."
The white 1971 to 1973 Holden HQ Kingswood station wagon was being driven by a man in his late 30s to early 40s.
He was either bald, or fair haired, and had neck and sleeve tattoos.
Det Insp Hughes said police were not just looking for a possible owner of the car, but someone who could have access to one like it, such as a mechanic or car salesman.
Police have investigated up to 30 main suspects in the case and a number have not been discounted from being involved, Det Insp Hughes said.
In 2013 a man claimed he hit Bung with his car and dumped her body at a local reserve.
But no remains were found and police said parts of the man's story didn't add up.
In February 2014, detectives announced a $1 million reward for information about Bung's disappearance.
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