That happened to me earlier this year. They said they had delivered it to our house but we never got it. This one came from Amazon.com. I contacted them and they sent me out a new book and this one was autographed. About 5 days later a young boy brought the package with the original book in it to our house. They live about 7 houses up the street and it was delivered to them while they were on vacation. When they came home they brought it to me.
When my Dell had battery problems and Dell sent me a replacement battery it never showed up. They tried 2 more times, and each time I never received it. On the 4th attempt I told the people to tell UPS to have me sign to verify that I received the package, it showed up no problem.
A couple months later our doorbell rang and it was a family from up the street. They had opened all 3 boxes, said they thought it was for them and didn't know why they kept getting so many (espicially since they are a Mac family). Apparently they had given them to friends/family that had Dells, then they realized the name/address on the box was different.
Also at my first job, a family was going on vacation and grabbed the mail that was on the front desk thinking it was theirs (why I don't know). They ended up taking three paychecks out of country with them.
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Do people really open up (or take) unexpected mail/packages without looking at the address?
Pari, I hope you get your books soon. I know how frustrating it can be to not get a package you are waiting for because it was mis-delivered and the unattended recipient thinks it belongs to them.