As Capt C mentioned, After my oral exam in Brisbane, I also filled form 419, paid for COR-COC and COR-GMDSS and international courier fee. Now, after obtaining residency, I sent the visa details by email and they have posted the documents to me and I have received the docs.
I think for your case, you will have to fill form 419 and send them an email to know the detailed procedure.
I emailed to :
quals@amsa.gov.au