I didn't do it. My copy has been mangled on occasion as well, even when I was still working there. It was probably the machine that the geniuses of the USPS mandated that did this.

Yeah, you can try UPS or FedEx, but...be ready to pay a LOT more for the privilege of getting your mail.

If this is a bad enough problem, don't complain to postal management. Complain to your congressperson. And document everything.