Getting cadastral data points for a property in Western Australia and Victoria.
Similar data should be available in all states, just search “cadastral points [your state]” or cadastral survey data your state.
Western Australia
Victoria
Go to https://discover.data.vic.gov.au/dataset/vicmap-property-cadastral-area-boundary-line
Scroll down the page until you see the large map. Zoom in on each corner of your property, click the corner and the cadastral data will pop up in a popup screen. Scroll to the bottom of that screen to see the Lat and Long coordinates.
2 minute video showing how to find: