GAVIN Moresby-White set off from his Queensland home on a road trip his family believes was meant to take him down the eastern side of Australia to Tasmania.

But, his vehicle was discovered abandoned about one kilometre down a remote dirt road in the Hunter, and now the 68-year-old retiree hasn't been seen in more than three months.

His family has now spoken out about their frustration and distress at the lack of answers after spending weeks searching bushland in the Gungal area themselves for any sign of Mr Moresby-White.

Shiralee Butterman said the disappearance of her uncle was out of character.

"He had a vehicle that was sound ... what he had packed was for a road trip," she said.

"For him not to end up at the destination or contact someone was a bit odd.

"To disappear like that, and to not be found ... is really obscure."

Mr Morseby-White was last seen on Greg Stairs Road, about 50 kilometres west of Muswellbrook, at about 10.30am on October 29 last year.

His family said police were notified about the abandoned vehicle on November 1, the same date Mr Moresby-White's wallet was found separately in Merriwa, about 40 kilometres away, and handed into police.

Police said concerns were raised for his welfare on November 15 and officers from the Hunter Valley launched inquiries into his whereabouts.

Ms Butterman said valuable CCTV and information could have been lost in the time police were waiting for a family member to make a report.

A NSW Police spokesperson said a multi-agency coordinated land search was conducted of the Gungal, Denman and Merriwa areas, which involved police rescue, PolAir, the dog squad, ambulance rescue and the NSW State Emergency Service.
 

Ms Butterman said the area Mr Moresby-White was last seen was on a national truck route and his family would like to see Australia-wide coverage of his case.
 

"Our concern is it was never nationally broadcast or televised," she said.

She said she believed police had ruled out his disappearance as misadventure and felt like they were waiting on police to feed them information about items that had been discovered in the absence of a liaison officer.

"We're just at a loose end," Ms Butterman said.
 

Mr Moresby-White was described as a quiet person who had been retired for about 18 months when he set off from Queensland to travel along the New England Highway through NSW, to Victoria and on to Tasmania.
 

He had no connections the family was aware of in the Hunter region.
 

"He did suffer from a mental health issue, which did play a little bit - could even be significant - in his situation, but where he ended up, we believe, he was just passing through," Ms Butterman said.
 

Family members have been undertaking their own searches with the support of drones and specialist resources from Sydney Search Dogs.

Ms Butterman said the three months since her uncle disappeared had been hell.
 

A NSW Police spokesperson said Hunter Valley detectives were continuing to make inquiries into Mr Moresby-White's whereabouts.
 

They said all missing person cases have an officer-in-charge as the ongoing contact person for next-of-kin seeking updates on the investigation.

A case review, in conjunction with the Missing Person Unit, was scheduled to take place shortly given the length of time Mr Morseby-White has been missing,

Anyone with information into his whereabouts has been urged to contact Crime Stoppers on 1800 333 000.
 

Mr Moresby-White was described as being of Caucasian appearance, about 170 centimetres tall, of medium build and with balding white hair.
 

Police said he was known to drive a Toyota Camry with Queensland registration plates 850MHT, which was found at Gungal.