^^ Yup, usps has a big contract with ups. A large percentage of usps mail winds up in the ups sytem, which does ship things bizarrely. I've seen packages going from one place in California to another place in cali here in the louisville hub.
This sounds like a description of a C mount diode to me.
As for the shipping:
I work at ups, and yes they suck. As for them putting a note if it was opened; nope. Everyday I see boxes ripped up, sometimes nothing is done. Usually some tape is thrown on it and it's sent on its way. I have seen...