This word you are using, "service," I do not think it means what you think it means.

Is there anything more useless on the planet than the Post Office's package tracking? Whenever I have the choice, I have packages shipped via any other carrier, but I don't always have the choice and so I have a fair amount of experience with USPS package delivery. I have never, ever, ever, ever had a package go past the "Electronic Shipping Info Received" stage of the tracking process, EVEN AFTER IT'S BEEN DELIVERED. Jerks.