If you are missing your sealed letter but still have the mission a GM can help. Send an in-game petition and we can return the missing letter.
If you are missing your mission a GM will be happy to investigate and correct any problems that can be verified.
Note: It is possible to fail this mission and be forced to restart from the beginning. If you are stuck after speaking to Forrester Enel Aban or Garboil Chi Shere you will need to retry the mission.