Here you will find all the ID and all relevant info about the letter from harkon
Letter from Harkon: Editor Name & Spawn id
What is the Editor Name of the Letter from Harkon?
DLC1VQ03MalkusNote
Letter from Harkon ID Code:
Dragonborn Downloadable Content Code + 0126C5
Letter from Harkon: Spawn Commands
Spawn Command to get the Letter from Harkon into the game:
Open the console and enter [player.AddItem] then the [Base ID] and then the [Amount]. With the example below, you will add one Letter from Harkon.
player.AddItem Dragonborn Downloadable Content Code + 0126C5 1
Spawn Command to place the Letter from Harkon in front of your character:
Open the console and enter [player.AddItem] then the [Base ID] and then the [Amount]. The example below places one Letter from Harkon in front of your character.
player.PlaceAtMe Dragonborn Downloadable Content Code + 0126C5 1