Girlie thank you for the info but Naylia is right, the big question is how to get the other caps.

I've tried talking to NPC's with the cap on and off, nothing. Opened treasure chests (including red ones) with it on and off, nothing. I've been to hamlets and find nothing.

As frustrating as it is, this is fun trying to figure it out. Hope there are simialr quests going forward!