Allow me to demonstrate why. Here is USPS’s tracking information.
Recognize that the locations are repeated?
Let’s put that on a map…
The package is accepted at a post office at A (Bloomfield), then to B (Kearny) and C (Jamaica). Then it gets shipped almost back to B (A different place in Kearny). Finally back to C again (Jamaica).
Seriously, what the hell, USPS?