Smart move, Brienne. The Postmaster General will provide paper, pen, and an envelope to write the second note. They nod when she hands them over, digs around under their counter until eventually producing a handful of stamps and an ink pad, and then they stamp the envelopes! One envelope gets, uh, stamped a couple of times with these guys, and the other gets stamped with this one. Repeatedly. A lot of times.

The Postmaster General beams as they delicately place the envelopes into the "outgoing mail" bin. They are very good at their job.