Private Bennett, an Indigenous digger who fought in some of the Great War's worst battles, died in a police lockup in 1950.

Labor Senator Tim Ayres, who brought the issue to parliament recently, said the fact that he does not have a headstone is "a deep injustice".

The Department of Veterans' Affairs last week vowed to properly commemorate the spot of his final resting place when it's discovered.

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Great-grandson Lloyd Waters said modern technology is their best hope available to them.

"That would be probably the only way you could do it," he said.

"You're more like flogging a dead horse [to try to remember]. Dad's 92 now and he was only a young fellow. Only about 9 or 10 people went to the funeral, and they've all probably passed away now."

Mr Waters said the story of the proud Kamilaroi veteran was defined by prejudice.

Private Bennett's son, Len Waters, took to the cockpit in the Second World War and became Australia's first Indigenous fighter pilot. But he could not get a commercial pilot's licence when he returned.

Neither men were citizens of Australia, despite risking life and limb to defend the country.

And Mr Waters said local RSL figures had initially dismissed requests by his dad to help search for the grave, and racially vilified both men for good measure, when approached in the years immediately after Private Bennett's death.

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It's time to right the injustice, he said.

"I've been over there a few times now, it's frustrating," he said.

I had to plant some flowers I brought with me, so just I sat them on an unmarked grave with nothing on it. I said if this is him, that's good. If it's not that's still good.

"I reckon that technology, it's marvelous how they can identify bodies even today, with DNA. I just hope it can work for my great-grandfather."

Kevin Hobday has spent years tracking down records to identify Private Bennett's grave.

He told the Leader he hopes a planned family reunion this year will dredge up a memory that will pinpoint the spot. At least two members of the family still have memories of Private Bennett, and his funeral - though they are ageing.

The meeting should happen in the next few months.

Moree Mayor Katrina Humphries said she was grateful for all the people who'd fought to get recognition for Private Bennett.

"We look very much forward to be able to honour his service and his life with the assistance of the powers that be that have very kindly acknowledged that there needs to be some sort of recognition for a grave that's gone neglected for many, many years," she said.

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