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@thecatspjs wrote:

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I still don't even know if it's legal to take back a letter/parcel once you've posted it. Is the PO obliged to hand it over if you ask?

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why does it even matter ??

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It was one of the two questions I asked in the OP.  I was hoping that the reps from Aust Post would answer the question as they do other postal questions, or that someone knew the actual ruling.

eBay transactions are largely based around the postal service, so it is not only a relevant topic for all traders, but also relevant to these discussion boards.

Amongst other areas, It is relevant to sellers who accidentally post items before payment is received (or reversed through PayPal after the item is in the mail) and also to buyers who return goods for refund before the refund is issued.

Plus, I just want to know, so that really ought to be enough.