Translation of "Letterbox" in Japanese

- I found your letter in the mailbox.
- I found your letter in the letterbox.

あなたからの手紙が郵便受けに入ってたよ。

- Muri arranged the letters on the front of my letterbox in the form of the golden ratio.
- Muri arranged the letters on the front of her letterbox in the form of the golden ratio.

麻理は自分の郵便受の表札の文字を黄金比になる様に並べた。

Muri arranged the letters on the front of my letterbox in the form of the golden ratio.

麻理は自分の郵便受の表札の文字を黄金比になる様に並べた。