» Tue May 22, 2012 11:02 am
Yes, Silus' home is also the Museum of the Mythic Dawn. You don't need the courier to start the quest, but the fact that Silus is MIA for you means you can't start the quest or break into his house since he's the only one with a key. He's supposed to be just outside talking to the court wizard when you arrive for the first time, and she does have a dialogue option regarding him I'm fairly sure but I don't know if it's only when she's walking back to the Pale Hall from Silus' house. I did dig something up about how if you go to either Dead Crone Rock or Cracked Tusk Keep prior to starting the questline, clear it and kill the dungeon bosses at the end, it becomes impossible to finish the quest. Doesn't say impossible to start the quest though so it's up in the air.
Unfortunately, Silus is NOT marked essential, so he may have died somewhere in between (maybe during a dragon attack, or if you riled the guards up they may've fired at him outside his house at which point he would attack them,) etc. There's not a lot of information on this specific glitch, and since there's no Hall of the Dead in Dawnstar, it's hard to say whether it's a bug or just really really bad luck.