ANSWERS: 2
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Unless you actually pay for the express mail or priority mail service, putting those stickers on your packages could get them returned to you for insufficient postage.
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If you are actually sending your package Priority or Express, then it just helps to identify your package as such. If you put the sticker on a package with less postage, it will go postage due and if they won't pay it, you'll be getting it back.
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