You would have been better off when the Officers refused to sign acknowledgement of receipt of your document, to have then sent that document to the Police Station by Registered AR (Acknowledged Receipt) mail. Meaning they would have had to sign on receipt of the letter when collected from Australia Post. The AR card signed by the authorised person from the Police Station has acknowledged receipt of your Registered mailed item, that AR card then would have been re turned to the sender of that document. If you worked at the Post Office which appears to be a Licenced Post Office (LPO) you should know this. Being an additional Australia Post Service, it would be legal, where as your video would not always be accepted in court.