Lets assume you just bought something and it is getting shipped via a major package shipping agency (such as FedEx or UPS etc.). You are given a tracking number which you can use to view where the package is. Now somehow a hacker is able to obtain this number. What could possibly be compromised?
Would the hacker be able to change the package destination to themselves?
Could the hacker steal personal information from the number (assuming the did not obtain any from the original method they got the number in the first place)?
An ideal answer would include a comparison of the different package carriers and additional information that could answer future questions