If you're moving from USA, then irrespective of whether you intend to stay in Australia, or return to the US, get tax advice about 401k/roth/australian superannuation. It's a problem either way.
And pray your orange fuckwit doesn't keep outfuckwitting himself.
Imagine if you were trying to transfer your money from one country to another recently, you could have easily lost 30%, simply because of the time it takes to withdraw, transfer and convert your money.