Evidence of signature of fiat, etc

Where under the provisions of any Act the fiat, authorisation, sanctuary, consent, approval or authority of the Governor-General, Attorney-General, Director of Public Prosecutions or any Minister is necessary before any prosecution or action is commenced, or for any purpose whatever in connection with any proceeding or before any other thing is done, any document purporting to bear the fiat, authorisation, sanctuary, consent, approval or authority of the Governor-General, Attorney General, Director of Public Prosecutions or a Minister shall, until the contrary is proved, be received as evidence in any proceedings without proof being given that the signature of such fiat, authorisation, sanctuary, consent, approval or authority is that of the Governor-General, Director of Public Prosecutions or such Minister.