I had this happen to me last year. My address was on the back and the buyers PO wanted them to pay extra, they didn't and the parcel was returned to me where i had to pay the excess and then had to send it again. It was also registered. When I went to pick it up from the PO where it came back to (by the way it came back to another PO not the one I usually use) I checked it all out with that PO person and they aggreed that it shouldn't have had any fees on it and it was the correct weight and thickness for the postage I put on it. I was going to put a complaint to the PO but the person who said it was OK didn't charge me the excess. I would have written a complaint letter though or rang the PO informtation line where I have been successful inthe past with similiar complaints. But I would complain.