Envelope Puzzle Tracing.
The Envelope Puzzle Tracing in Silent Hill: Downpour is a mystery entry obtained after completing the Scattered Envelopes puzzle in the Centennial Building. Once all the envelope pieces have been put together, a traced version will be copied into the journal. The following number is present on the envelopes: "851136". This is used on the keypad of a door on the second floor.
Unlike certain puzzles before it in past installments, the numbers don't have to be entirely perfect in order to carry out the puzzle; once the numbers are clear enough to the player, whether or not they have been copied into the journal, Murphy can unlock the door.
Transcript[]
851136
The envelope puzzle solved.