Harbin's eyes pop wide open when you report that you've cleared out the orcs in Wyvern Tor, "Umm... well then, I suppose I had promised a reward, didn't I? Wait here," he says before moving into a back room. A couple of minutes later, he returns with two sacks of gold, "100 gold, as I said, and good enough for the work you did."
Mentioning Sildar, the townmaster sighs, "Ah yes, Sildar took Iarno and the Redbrands to Neverwinter with a caravan that left yesterday. He said that Gundren was ok, and left a note for you." He reaches into a cubby behind the desk and hands you a hand-written note:
I'm sorry I couldn't stay to let you know what I was doing, but the caravan is leaving in the morning and Phandalin doesn't have a big enough jail to house that many prisoners. I will be returning in a tenday, after I check up on some things in the city. Gundren awoke this morning and is quite anxious to speak to you all.
Sildar Hallwinter
PS. I've left a small monetary reward for all that you've done for the town. Don't let Harbin try to keep it from you!