原文だと "Seal" だから、手紙を封印する蝋のヤツと思われる。封印【紙】ではないですね……
The Purloined Letter(Poe)
"In the meantime, I stepped to the card-rack, took the letter, put it in my pocket, and replaced it by a fac-simile, which I had carefully prepared at my lodgings — imitating the D—— cipher, very readily, by means of a seal formed of bread."
#読書