I used to live in the upper level of a duplex. To get to my apartment, you had to enter through the backdoor and go up the stairs. My neighbor could enter her apartment either through the front or back. However, she never so much as opened the front door. She always used the back. I bought my boyfriend a couple of CDs, and they were shipped via UPS. They didn't arrive, so we called them. They said the package was delivered. No one ever came to the door and nothing was left by the door. We asked our neighbor below us if UPS came to her door. They hadn't. My boyfriend went out front to see if the package got left on the front steps. No package there either. We called UPS back, and they contacted the delivery guy. He told them that he wedged the package behind the front screen door. My boyfriend went back downstairs, and opened the front screen door. Sure enough, the package feel out. The space between the screen door and the wooden door was really slim, so the package was really jammed in there. Naturally, the CD cases were destroyed. Thankfully, the CDs themselves survived.