Don't know how to do a return, can't do a photo.

Just want to return shoes as not right size., or get right size.  Post Office want me to pay!!

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If a parcel is opened, then if you want to return it AusPost will want money - regardless of whether it is your fault or the seller's fault. If it is the seller's fault though you should open a return request and ask the seller to send you a label which will allow you to send the parcel back without paying yourself (the seller will pay). But if it is your fault you will have to pay yourself.

The only way to send a parcel back for free is when you don't accept it, in which case you should not open it either of course.