The National Library of Australia has just published this digitalised newspaper article on its Trove website:
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The Dubbo Liberal and Macquarie Advocate, Monday 31 December 1900, p.1

The Mawbey property.

An exchange states that Mr John Mawbey, whose home was the scene of the first tragedy by the Wollar blacks, has sold his selection at Breelong for 2300 pounds.

Soon after the tragedy Mr Mawbey expressed his determination to leave the scene of horror as soon as he was able to dispose of the property. [Source: nla 72492322]

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At the time of the murders, in July 1900, the extent of John Mawbey's land holdings was 1500 acres.