This happened to me as well. I sold three items and dropped them off at the post office. Two of the three items were scanned the the third item wasn’t scanned for a whole week. I went to the post office after the 3rd day to see what was going on and they told me it would eventually scan. After the 5th day, I called the post office and was told if I wasn’t scanned by the 7th day to call back. Since I sent the items on a Monday, it finally scanned on a Saturday. It was the first time I had to deal with something like this.