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I have no idea what I did wrong. Or even if I did anything wrong. After clicking "print label" and choosing printable postage with DC, I entered the weight of the paperback as 7 oz., anticipating to pay for and use the Media Mail rate. Then I adjusted the mailing date for tomorrow's date and printed the wrapper. A little later, when I started wrapping the book, I then noticed the postage was for FIRST CLASS mail, not MEDIA MAIL. Before I taped it, the book weighed 6.9 oz. and even though I skimped on the mailing tape, the book now weighs 7 oz..
What can I do?