Buying and printing postage labels, packing slips and order receipts - eBay If unused, make sure to void the label within 12 calendar days to get a refund. Here's how to void a postage label in My eBay or Seller Hub: Select Selling in My eBay, or select Orders on the Seller Hub Overview page. Select Postage Labels on the left-hand side. Select Actions next to the label you'd like to void, and select Void Label.