I know non-NPIP folks do it all the time and NPIP folks neglect to put the paperwork on there as well. I would hate to be the one they make an example of, though, you know? And I've also seen too many boxes of dead chicks the age mentioned in this thread because I think they are growing so darn fast, they need way more food than is normally put into the boxes. At hatch, they can go three days without food and water and older birds can get enough from fruit, etc, but super fast growing chicks don't fare as well in shipping, IMO. I believe that's why the USPS rules are in place.