TV series example of the word

The Big Bang Theory Season 6, Episode 19
Howard, I found this letter from your dad in a box.

The Big Bang Theory Season 6, Episode 19
Control over the information contained in that letter belongs to Howard.

The Big Bang Theory Season 5, Episode 16
that soap company a strongly worded letter.

The Big Bang Theory Season 12, Episode 9
and Sesame Street Letter School,

Game of Thrones Season 7, Episode 7
I know of no such letter.