Customs don’t check on everybody. They perform random checks in the airport when you arrive. If they check on you they would ask you to prove your funds. You can either have a printed bank statement with you or login to your Online Banking and show customs.
No you do not need to transfer your money into your Australian bank account. However, it can be expensive to use your debit/ credit card in Australia so we recommend transferring your money into your Australian bank account.
If you have a return ticket or a ticket leaving Australia then you need to have the equivalent of AUD$5,000. If you do not have a ticket leaving Australia then it is a requirement to have the equivalent of AUD$6,000 in your account.
Please visit a CommBank branch and ask them to update your profile with your address that you are currently staying. They can then print out a bank statement with your full name and address. This document is sufficient to prove your address with OFX.
Both options are fine – while you are still at home or when you are in Australia. We strongly suggest you get started while you are still at home as in a few cases, OFX will require proof of address. This is easier to submit when you are at home.