FWIW, I used to work at an online wholesale outlet. We shipped via FedEX, UPS, and USPS. We sold mostly consumer electronics (GPS, Car Stereo, Metal Detectors, PDAs, etc.) Often we would ship just about anything via UPS or FedEX with little or no worries, but if we shipped through the post office, we had to wrap the entire package in tape with the shipping address / return address under the tape and the entire box perfectly sealed (I mean airtight with two or three layers of tape). We did not send out a single item that wasn't certified and insured through the post office. Seemed to me that those unnecessary precautions were only needed with the post office. I know UPS and FedEx automatically insure all packages up to $100 US, anything valued at more than that was usually insured to the exact amount but I stress again, it wasn't an issue with UPS and FedEx.
Recently (two years ago) a friend of mine in Chicago decided to do me a favor and ship me MS Flight Sim 2004 Pro for my birthday. He shipped it postal, packaged it correctly, taped my address and his to it. As of this date, I still have not received it. He did not insure it and the postal service has flat refused to help him locate the package. His best guess is that someone there opened it and took it.
I hadn't given much thought to the practices used by my former employer for using postal service. Apparently this is the norm for almost every business that regularly ships items through the post office (i've asked). Guess the post office works the same way as every other branch of government service.
-Sun Runner-