The last page of the manuscript received by Poe appears to have been a photocopy. Rampo seems to know why, but there are still more mysteries surrounding the death of the author.
"bright
red
envelope" is 
the 
key.
"الأحمر
الفاتح" هو 
.المفتاح
Der Schlüssel liegt
im roten Umschlag.
el sobre rojo.
el sobre rojo.
La clé de l’énigme,
c’est cette enveloppe.
"busta
rosso
acceso" è
la
chiave
"envelope vermelho" é a chave.