Until someone comes and steals your letterbox because it's made of copper! :D
Did you know that Australia Post has a whole bunch of rules and regulations and standards that a letterbox must meet for them to deliver mail to it? Crazy occupational health and safety stuff. Wonder how it will change as they retire those Honda motorbikes and move to other vehicles like the Electric tuktuks I see roaming around my neighbourhood :P
Now ay really? Well I get mail delivered so maybe my boxes always pass reg...I saw an Indian guy with aviators and a handlebar moustache and full postal high vis pants and jacket yesterday at the Bunnings point counter. When the woman rocked up she took one look at him and said 'sorry, I didn't see you there' and he did not look amused...
Always say hi to the person wearing camo tho...