Mail covers[1] are a very old surveillance technique and mail isolation control and tracking/MICP[2] has been standard on all parcels since early 2000s 1: http

Mail covers[1] are a very old surveillance technique and mail isolation control and tracking/MICP[2] has been standard on all parcels since early 2000s 1: https://en.wikipedia.org/wiki/Mail_cover https://en.wikipedia.org/wiki/Mail_cover 2: https://en.wikipedia.org/wiki/Mail_Isolation_Control_and_Tracking https://en.wikipedia.org/wiki/Mail_Isolation_Control_and_Tra...