Send a notice to a “Government Department” asking for validation they are legitimate under the Commonwealth of Australia Constitution Act 1900 (UK) and likely you will get a response that states … “Your claims are baseless!” – or they may just ignore you.
Assuming they reply… have you actually made a claim – or did you just seek information? Putting that aside momentarily, why would they state “Your claims are baseless”?
Could it be the “Australian Government” isn’t actually bound by the Commonwealth of Australia Constitution Act 1900 (UK), meaning their masters are not the people comprising the Commonwealth?
Perhaps they’ll send you the form they want you to fill out again… as if you didn’t get it the first time. Maybe they’ll write that your matter has been considered and denied… if you disagree with our decision you can take the matter to court. Fat lot of good that would do in an environment where all are unwilling/unable to validate their authority!
Alternatively your reply may instead use words such as .. “your letter has no basis in law”, or … “your letter has no validity”. Look who’s making claims now!