[monkey123.]

they just take it to my local post office maybe because the assigned mailbox for my address can only fit letters.

That's strange.

Regardless of the mailbox size, Australia Post attempts to contact the recipient on arrival and If no one Is there to accept the delivery, the package Is redirected to the nearest post office. Not sure why It's not the case with yourself. At any rate, you will need to show your ID when collecting the package, which complicates the DNA.

They never ask for id tho I just show them a QR code if that changes anything

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Do they not buzz you on arrival and If you don't answer, a missed delivery note Is left and It's then taken to the post office?

they just take it to my local post office maybe because the assigned mailbox for my address can only fit letters.

Someone at your address may have setup parcel redirection which may explain why they are all automatically going to the post office.
I'd jump in Auspost liveChat and ask them why your parcels are going straight to the post office without you having a chance to collect it from home.

Thanks for letting me know hopefully I can change it so it doesn’t automatically get sent to the post office.