This is a common problem with a lot of people, used to happen to me frequently. They're either lazy to bring it to your door or are running behind on their route or something so they just say they attempted to deliver and just skip you. I called amazon to complain about their carriers and called the post office to complain.
If you received an email informing you that they attempted to deliver the pkg. I would to the post office with your I.D. and see if they have it.
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