The only one left for you is Torben, the caravan merchant. You can find him either at his house in the expanded Bareshade ot at River's Bank (Take a break option)
I tried talking to him by taking a break but wasn't given an option to complete the quest there. As for his house, how exactly can I find it? I've looked all over for another way to talk to Torben that might have the needed dialogue choice.
I did meet him on the track, by taking a break at River's Bank, but there's no option there. I'm still in the middle of the Bareshade expansion though. I realized that might be where his house is when I went back into my game
