Alright so I've been renting this house for a few months now, but I still always get mail intended for the old residents, and none of them have ever attempted to reteive it. So surely it would be safe to order under their name and just open that mail when it comes right? P.s I only plan on shipping lsd, so no sign required, 50 tabs at most.
Did you even use the search engine? This has been gone over again and again. Do not use a fake name. Even if you are receiving mail at your box addressed to that name.
Let me ask you this: What is the nature of that mail you receive? Is it mostly junk mail or are you receiving bills, magazines, letters, and packages? Because I've lived at my current location for about five years and I still receive the old residents' junk mail. I think the post office is pretty good about saying "Well, that's clearly junk, let's not bother with forwarding it." instead of just forwarding every piece of mail addressed to that person.
This is USA btw, so I dunno. Aus post might be less competent than USPS, though that would have to be pretty bad.