Confidential documents on Dylan Voller, whose experience in youth detention sparked a royal commission, are among those of 39 clients of Territory Families accidentally dumped at the Alice Springs tip.

Territory Families has previously said the confidential files had been mistakenly sent to the tip in a cabinet during a refurbishment.

Mr Voller has shown the ABC a letter from the department's CEO, Ken Davies, confirming his file was among them.

"My family history is not for other people's eyes and people, and things that I've gone through [when I was] younger," he said.

"Not everything is for everyone else's eyes."

He said the department clearly did not have appropriate strategies in place to deal with the storage and disposal of confidential documents.

"Someone should have gone through the cabinet and made sure they've been put into appropriate spaces before someone was even refurnishing," he said.

A Territory Families spokesperson said the loss of any documents was not good enough.

"Territory Families is confident that the materials have been recovered and to the best of Territory Families' knowledge were not disclosed to third parties or copied in any way," the spokesperson said.

"Extensive internal and external investigations have been undertaken regarding the accidental loss and recovery of documents.

"These investigations included review of CCTV footage from the Alice Springs Waste Management Facility. All the filing cabinets relocated have also been accounted for."

The department said the reviews made eight recommendations, seven of which had been implemented with the eighth in progress now.

'Suspicious' that high-profile detainee's files were dumped

Mr Voller is one of the most notorious people to have come into contact with the child protection and youth justice systems.

Images of him shackled to a chair with a hood over his head, and being held down and stripped were crucial parts of a Four Corners report that led to the Royal Commission into the Protection and Detention of Children in the Northern Territory.

The commission wrapped up its public hearings last week.

Mr Voller has become something of a lightning-rod for polarising public opinion on youth criminals and how the justice system should deal with them.

He has raised the question of how the confidential files of such a high-profile former detainee could be thrown away.

"I do find it a bit suspicious that out of all the files in that place that my name has popped up ... they could be anywhere," he said.

"How do we know [tip shop staff] didn't give them to someone who doesn't like me, with all the stuff that's been happening on TV, and photocopied it or something like that?"

The letter from Mr Davies said 17 of Mr Voller's documents were recovered, but it does not state how many are still missing.

"I think more needs to be done and more information needs to be given to the people whose files have been put out there," Mr Voller said.

"How do we assure [people] that every single document has come back with every single page?"

Territory Families has been contacted for comment.

When it first announced the files had been lost, it said an external investigation had found the loss was accidental.

Possible compensation of up to $60,000

The privacy breach was "very disappointing", NT Information Commissioner Brenda Monaghan said.

"Incidents like this don't happen often," she said.

The department cannot say whether the risk of the loss of the files has been fully mitigated.

Ms Monaghan said anyone effected by the privacy breach could eventually receive up to $60,000 in compensation.

But she said people should first contact the department and ask for action to be taken before contacting her office.

"If anyone whose privacy has been breached is concerned that those steps are not sufficient, they can obviously come to our office and we can consider their concerns and conduct an external review," she said.

"The sorts of orders that can be made are an apology, an order to prevent or various orders to prevent the matter happening again, and also compensation can be paid, including compensation for hurt and humiliation."