Matt on Instagram: "FREE USPS Boxes !!! Just Arrived From Poshmark 👀📦 If you want to order yours, here’s the info ⬇️ They do take a little while to arrive, so go ahead and call now. Phone Number: 1-800-610-8734 Press 1 → Ask to order USPS Ground Advantage supplies for Poshmark. * Should be used for posh only (tbd) Hours: Mon–Fri: 7am–11pm EST Sat: 7am–6pm EST (Closed Sundays + holidays) You can also email: [email protected] Include: • Your name • Poshmark closet name • Mailing