I believe this is supposed to symbolize a courier rather than realistically represent one, as this is something that a courier might deliver.
Correct! The envelope will be in the Modifiers section; put it behind a Knight for (my version of) a Courier, or behind a Knightrider for a Pony Express. And I'm sure there are other applications as well (like, combine it with a Minister for a Postmaster General).
Edit: All of the new ones, except Two-Thirds, went into Modifiers (the other new ones are Anarchy, Crutch, Maple Leaf, and Wine Glass).
Correct! The envelope will be in the Modifiers section; put it behind a Knight for (my version of) a Courier, or behind a Knightrider for a Pony Express. And I'm sure there are other applications as well (like, combine it with a Minister for a Postmaster General).
Edit: All of the new ones, except Two-Thirds, went into Modifiers (the other new ones are Anarchy, Crutch, Maple Leaf, and Wine Glass).