在48R表格前面的application checklist里面有提到邮寄护照的问题
details of how you want your passport returned. The department does not recommend return of passports by ordinary mail. Your passport can be returned by:
• registered mail (please include a passport sized envelope with your address and sufficient postage
for registered mail); or
• ordinary mail (please include a passport sized envelope with your address and sufficient postage);
or
• courier (please check with the office where you wish to lodge your application regarding courier
arrangements)