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Something's not right there. The postage is supposed to be included when you get the box. My post office has always given me the box and charged me for the postage when I mail it.

I know a lot of...

The boxes are free. The $5.20 you've been paying is for the postage. When your boxes are delivered, you'll still have to pay the same $5.20 to ship the items when you take them to the post office.