In Reply to: don't panic. It is simply a matter posted by bloodyron on Saturday, 28. February 2009 at 07:01 Bali Time:
My concern would be at the checkin in Australia before they leave. Airlines are responsible to ensure that passengers have passport and visa or can get a visa on arrival. Once in the air the rest is simple, just write 30 days and an earlier departure date on entry card and just accept the fine.