A lot of us buy and sell on the Spot. So here is a little situation you need to be aware of.
Recently, I sold something and I sent it USPS. The package was tracked but when I checked their web site it showed that the package was trying to be deliver to someone in Arizona. I inquired and found out the USPS re-uses their tracking numbers. This has just happened to someone sending something to me. Apparently the fellow in Arizona is the default recipient of all packages.
If you use USPS and you package tracking says that your package is going to some address in Arizona don't fret everything is OK. You have just fallen victim to our illustrious postal services inability to come into the 21st century.