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Is it okay to just put stamps on a large envelope (9x12', 12'x12') and put it in a mailbox, as long as it is under 13 ounces? Or does it have to

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Pro tip: Don't ship collectibles in free USPS boxes; if you

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Has anyone sent a tiny box through the mail? I want to send a 2” x 2 x2 box in the mail but I'm curious about shipping fees. Would I have to

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