I didn’t receive a return envelope in my Dia Style/Active Box. Send us a note us at [email protected] and we’ll email you the PDF of a new prepaid return label right away. You can use your box—or any other box or envelope—to mail back your returns. Related articles How do I mail back my returns? What do I do if the items don’t fit in the return envelope? Do I pay to return items I'm not keeping? I didn’t like any of the items—what do I do now? What do I do with any items I’m exchanging?