This is nothing new, except maybe the fine, Australian border control can confiscate any device you fail to unlock for inspection.
As to reasonable/probable cause, not even on the books, don't want to comply, get detained, deported if on a visa or held for further inquires if a citizen.

You may be able to get a police check done for personal data, but no chance you can get an Interpol or international check for flags, not part of freedom of information acts.