Well, 'The Courier' is purely fictional. The plot and characters were imagined by the writers for entertainment purposes. There's no real-life basis for it.
I don't know. It might have elements of truth or it could be completely fictional. You'd have to look into the background and author's statements to know for sure.
Not really. 'Courier' is mostly a fictional creation with elements that might draw inspiration from various sources but not based directly on a specific true event or person.
It gives a sense of authenticity. Since it looks like a typewriter font, it can make the story seem more real, as if it was written in a more personal, hands - on way.