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Priority Mail Large Flat Rate Box 12 1/4" x 12 1/4" x 6" – Stamps.com Supplies Store
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Brown postal box for flat products
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USPS Flat Rate Boxes, Envelopes, & Pricing - EasyPost
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Royal Mail Small Parcel Postal Mailing Cardboard Packing Boxes Flat Pack | eBay
Priority Mail Small Flat Rate Box 8 5/8" x 5 3/8" x1 5/8" – Stamps.com Supplies Store
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