Postal Boxes -C4 (PiP - Large Letter)
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Is using large flat rate box not allowed? See comment for details... : r/poshmark
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Priority Mail Flat Rate Legal Size Envelope 15" x 9 1/2", 10/pack – ONYX Products®
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Large Envelopes and Flats
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USPS Priority Mail Express Stamp for Flat Rate Express Envelope ($30.45 value) | eBay
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3 Ways to Put a Stamp on an Envelope - wikiHow
3 Ways to Put a Stamp on an Envelope - wikiHow
Large Letter Postal Boxes | PiP Box Shipping | Kite Packaging
