At top left of the AP registered lodgement form there is a space to add the Ap article ID sticker. The stickers are in 2 parts, the larger goes on the item to be mailed, the smaller on the receipt, which you should get rubber stamped at your PO counter. both parts of the sticker have numbers. these are the tracking numbers you add into your "ebay sold" page as a reference. Keep the lodgement form as your proof of postage. You fill in buyer name & address yourself before mailing.