The 6 P's: Previous Perth Parent Processing Public holiday Problem

This is the email being sent out by the Perth Parent visa centre (note no officer first or last name and no position number, just 'Admin'):
UNCLASSIFIED
As no mail could be delivered on 2nd June due to the public holiday in WA and as that mail would have been in the GPO before the repeal date any mail coming from the post office and delivered on the 3rd will be accepted as valid. Couriered applications will not be accepted as valid.
Admin
Parent Visa Centre
Department of Immigration and Border Protection