Вот очень интересно - курьерские службы потому такие дорогие, что должны заплатить ЮСПС за банальное "крышевание". Свод законов называется Private Express Statutes (http://en.wikipedia.org/wiki/Private_express_statutes).
Private mail delivery service In addition, it is possible to set up a private mail delivery service known as lawful private carriage if the USPS postage is paid in addition to any private postage fee that is collected. Records must be maintained that such postage has been paid, and it may be affixed to the letter cover by US stamps, meter imprints or through another method approved by the USPS; the postage must all have be cancelled by the sender in ink; the date of mailing is also affixed in ink to the cover (either by sender or carrier); and the letter cannot be removed without defacing the cover from the envelope or other container in which the letter is sent. An agreement must be entered into with the Postal Service to conduct volume private carriage through the Chicago Rates and Classification Service Center which has national responsibility for the PES.
no subject
Private mail delivery service
In addition, it is possible to set up a private mail delivery service known as lawful private carriage if the USPS postage is paid in addition to any private postage fee that is collected. Records must be maintained that such postage has been paid, and it may be affixed to the letter cover by US stamps, meter imprints or through another method approved by the USPS; the postage must all have be cancelled by the sender in ink; the date of mailing is also affixed in ink to the cover (either by sender or carrier); and the letter cannot be removed without defacing the cover from the envelope or other container in which the letter is sent. An agreement must be entered into with the Postal Service to conduct volume private carriage through the Chicago Rates and Classification Service Center which has national responsibility for the PES.