Here's the directions from PayPal's Help Center... You can void an unused shipping label within 48 hours of creating it, and you'll receive a credit in your PayPal account. Either click the Void Label link in your email receipt, or follow these steps: Log in to your PayPal account. Click History at the top of the page. Find the PayPal payment for which you created a label, or find the USPS payment. In the Details column of the payment, click Details. Go to the bottom of the Transaction Details page, and click Void Label. Click Void Shipment. Here's when you can expect the credit: For Priority Mail®, Express Mail®, First-Class Mail Parcel® Parcel, Express Mail®, International and Priority Mail® International: It can take up to 15 calendar days for the U.S. Postal Service to approve your request and credit your PayPal account for the voided shipment. If you paid extra for insurance, it will also be refunded. For Media Mail® and Parcel Post®: It can take up to 21 calendar days for the U.S. Postal Service to approve your request and credit your PayPal account for the voided shipment. The credit includes fees for Media Mail and Parcel Post labels. https://www.paypal.com/webapps/helpcenter/article/?articleID=94002&m=SRE#void_U.S._Postal_Service_label
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