The homes are among 1049 properties cleared of Mr Fluffy loose-fill asbestos insulation 20 years ago, many of which have since been found to still contain the dangerous fibres.

One was the Deakin home at the centre of allegations about whether its history had been properly disclosed. It is understood to have sold for around the land value of about $640,000, well below the original asking price of $870,000.

The other belonged to a member of the Fluffy Owners and Residents' Action Group, which promotes full disclosure of the asbestos issue to potential buyers as well as tradespeople and others.

Action group spokeswoman Brianna Heseltine said the fact the house sold would be welcome news for other owners.

"It shows that our pro-disclosure stance hasn't prevented this sale," she said. "It also sends a clear message to the broader market that there is no excuse for ducking disclosure."

The family had been fully open with the buyers, who had signed the asbestos report.

The house sold for $60,000 less than it would have if it had not been a Mr Fluffy home, showing that Mr Fluffy homes will sell but people must be prepared to drop their price, Ms Heseltine said.

The case also showed that disclosure of Mr Fluffy homes would "appropriately pierce the real estate bubble, preventing innocent purchasers from paying normal market rates", Ms Heseltine said.

Owners of the Mr Fluffy homes would be seeking reparations from the government through the new taskforce for economic losses as a result of "systemic market failures over many years that saw homes being sold without full disclosure".

The Deakin home was at the centre of a debate about whether interested buyers knew it was a Mr Fluffy house, with one buyer saying he was not told by the agent. He said he only discovered the history after insisting on an asbestos report, then calling the removalist when he was on the point of exchanging contracts. The agent denied the claim, and another potential buyer of the home said the agent had told him, prompting him to pull out of the sale.

It is now believed to have been sold to a developer for demolition. The Luton agent did not return calls on the subject.

It is clear that Mr Fluffy homes are entering the market since the February mail-out to owners, which warned that houses should be tested for remnant asbestos fibres.

The Deakin case brought the issue of disclosure to a head, with the Real Estate Institute warning agents that full disclosure was paramount, as with other "stigmatised" houses.

The government has now produced guidelines for agents and property managers, but is still not requiring agents to use the words "Mr Fluffy" – instead requiring them to tell potential buyers when houses have had "loose-fill asbestos" removed in the clean-up of the late 1980s and early 1990s.

Chief Minister Katy Gallagher is expected to release details on Thursday of an emergency financial package for Mr Fluffy home owners forced out of their homes by the discovery of residual fibres of the cancer-causing material.