If you think that regular mail companies are slow getting to Australia (as opposed to courier companies like DHL, who often use their own planes), Australia Post out of the country is so bad, that an item I posted to America on May 5th, is still sitting in Brisbane somewhere waiting for a plane to America... almost 3 months later.
Since regular mail from the post office often hitches a ride as cargo inside commercial planes, we just haven't had enough of them flying from here to America to take mail with them.

Unfortunately, it would be impossible to have the item sent back to me while it is sitting somewhere among thousands of other items in a container waiting to leave the country, so my friend waiting for it could well be waiting at least another 6 months if international flights won't start again between Australia and America before there is a vaccine.