Dan Andrews Admits Cause of Lockdown 6 is the same as Lockdown 5, page-9

...premier dan says they don't know where it's from

https://www.theguardian.com/australia-news/live/2021/aug/10/australia-covid-melbourne-covid-gladys-berejiklian-sydney-lockdown-andrews-vaccine-melbourne?page=with:block-6113254b8f0811859fec3f55

The fact that outbreaks that are already challenged by the fact that we can’t determine where the original source, where the index case was and how they got it