What do I do if I didn’t receive a prepaid return mailing envelope? Send us a note us at firstname.lastname@example.org and we’ll email you a new prepaid return label in PDF form right away. You can use your box or any other box or envelope to mail back your returns. Related articles I love something in my box but it doesn’t fit. How do I request an exchange? How do I mail back my returns? Do I pay to return items I'm not keeping? Do I need to pay for shipping on a size exchange? What do I do with the item I’m exchanging?