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>You need to get the book shipped to your place first and then you need to ship it to the buying website.

Why not just have Site A ship to the end customer directly?

You need to swap the labels. The buying site gives you a label to put on the box so that they can keep track of who sent what.

Also, some sites like chegg send Red Bull, Starbucks or even cosmetics in the box that you would want to keep.