"Почтовый Ящик" – дополнение к игре "Письма Призрака".

About Ghost Letters: Letterbox, from BoardGameGeek:

In the "Letterbox" expansion, you will find 150 new Clue cards, 2 new characters, 1 secret role, a 4th-category token. The box also becomes part of the game – it is a true Letterbox, via which the players now send letters to the Ghost.