USPS tracking sucks too. I shipped a network harddrive to some deadbeat in AUstralia and since the bastard paid for 3 week shipping. It was going to be shipped and delivered within that time frame.
Since USPS doesnt update their tracking information like UPS and FEDEX
idiot put a claim through paypal and long story short they reimbursed him.

Ohh, a few weeks after that I chekced the tracking number and it was delivered.
USPS- FTL big time