There is evidence that the USPS has been logging all that metadata. http://www.nytimes.com/2013/07/04/us/monitoring-of-snail-mail.html http://www.nytimes.com/2

There is evidence that the USPS has been logging all that metadata. http://www.nytimes.com/2013/07/04/us/monitoring-of-snail-mail.html http://www.nytimes.com/2013/07/04/us/monitoring-of-snail-mai... https://en.wikipedia.org/wiki/Mail_Isolation_Control_and_Tracking https://en.wikipedia.org/wiki/Mail_Isolation_Control_and_Tra... I'm not saying that it's right but it apparently is happening.