When you live with another person long enough, you learn the best place to leave notes, messages and stuff for them. It's someplace you know that person will notice it that day.
Sometimes it's on the fridge, maybe their nightstand or desk. Maybe a "post it" on the bathroom mirror.
Well, the "Fiancee" knows exactly where to leave things for me... the first stop in my morning routine...
My "in house" mailbox has late afternoon pick up as well. I usually brew a fresh pot between 5pm and 7pm.