During class, Yokoi-san notices that there are a lot of notes going around. She looks next to her and sees that there's a lot going on with Seki-kun's desk...
"Please deposit any mail outside business hours
"Bitte werfen sie außerhalb der Öffnungszeiten ihre Briefe
"Por favor, depositar la correspondencia 
que será enviada en horario no laborable
"Por favor, depositar la correspondencia 
que será enviada en horario no laboral
« En dehors
des heures d’ouverture,
"Fuori dall'orario d'ufficio, 
si prega di depositare le lettere
"Fora do horário de funcionamento, por favor, deposite as correspondências