Daryl Floyd thanked followers of his Facebook page Missing Terry Floyd for sharing information about a fawn-coloured panel van, which was sighted on the day Terry went missing in 1975.

The 12-year-old is believed to have been abducted from the side of the road while waiting for a lift in Avoca on June 28.

Mr Floyd believes his younger brother was murdered, with his body dumped in a nearby mine.

He said locating the 1969 Holden HT panel van could help investigators with the cold case.

Mr Floyd said DNA found in the vehicle could provide investigators with more clues. Mr Floyd’s Facebook post about the panel van attracted 10,000 shares on social media at the weekend. 

“(I) would just like to say a great big thank you to each and every one of you for your help in locating this panel van,” he said. “Over 10,000 shares of the post in the search for this van and a lot of information received.” 

Mr Floyd stressed the van had not been located, but said the information received could help with the case.

“The information is going a long way,” he said. 

Mr Floyd said the information could be passed onto the Australian Association of Motor Clubs to help locate the van.

The news follows police investigators being handed new information about the cold case earlier this year. 

Mr Floyd had received a letter with more information about what happened on the day of Terry’s disappearance.

The anonymous letter writer said he saw a car, matching the description provided by other witnesses, near the Lead Dam in Avoca.

Three other witnesses have previously told police they saw a fawn coloured van on the day of Terry’s disappearance. Cold case investigators in March revealed convicted paedophile Raymond Kenneth Jones remained a person of interest. Mr Floyd believes two people were behind his brother’s disappearance.

“Terry did not lose his life at the hands of one person, there were two people involved at the time,” he said.