Found the following article online, use it to answer the question: Where would George and Helene go to leave messages for each other?  A common convention in the early decades of newspaper and magazine film reviews was to describe in the write-up the entire storyline including, in a substantial number of instances, the ending, thus unintentionally enabling subsequent generations of readers to reconstruct a lost film's contents. True to form, those who evaluated Seven Faces, such as Mordaunt Hall of The New York Times, did go into considerable detail regarding plot twists, as related herein below.Papa Chibou, the elderly caretaker of Musée Pratouchy, a Parisian wax museum, feels a strong kinship with the figures, particularly with that of Napoleon. He spots at the waxworks a romantic young couple, Georges, a lawyer, and Helene, the daughter of a stern judge who disapproves of his daughter's choice and forbids her to see Georges. Papa Chibou suggests to them that they can still stay in touch, without disobeying her father's directive not to speak with each other, by placing secret personal messages in the pockets of Napoleon's uniform. However, a missing letter and confusion in communication causes Georges to arrive at the mistaken conclusion that Helene has redirected her affections towards a foolish young man, who is unworthy of her and excessively preoccupied with his stylish personal appearance and elegant clothing.
The answer to this question is:
Musée Pratouchy