I have come across a bug that will not let the quest progress. When I get to the warehouse and kill Sarthis, I go search the satchel, but it's empty. Since there is nothing in it, I can't get the note that is needed to continue the quest.
Anyone know what to do?
Leave the warehouse, then wait several in-game days. Sometimes the places will reset (depends on the place, I forget if you can reset the warehouse but it is worth a try). After waiting, go back to the warehouse and see if it is in the satchel. I don't think it will work but, as I said, it is worth a try.