Here you will find all the ID and all relevant info about the letter from maven
Letter from Maven: Editor Name & Spawn id
What is the Editor Name of the Letter from Maven?
LetterRiftenBlackBriarBannedMare01
Letter from Maven ID Code:
000F6894
Letter from Maven: Spawn Commands
Spawn Command to get the Letter from Maven 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 Maven.
player.AddItem 000F6894 1
Spawn Command to place the Letter from Maven 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 Maven in front of your character.
player.PlaceAtMe 000F6894 1