I used to work for fedex (thats where I worked when I hurt my back) and I can tell you we didn't have to open any packages to know what was in the package, each package comes with a manifest and on that manifest it states where the package is from (not just an address) and even sometimes it will state what is in the package. I actually worked for the LTL (less than load) freight company that fedex merged with and not sure that is how the small package company works but I do know that the freight part had these manifests that had all this information on it, we had to scan these manifests with a bar code scanner and actually all the information would come up on the computer screen that was at every door so there was no reason to open a package to see what was in it even though some packages did get opened but onluy because the loader wanted what was in the package for themselves