Treasure #1
Received from the grateful sister at the end of the Bounty Hunter Quest.
Treasure #2
Given at the end of The Lost Trader Quest.
Treasure #3
Given after killing the final assassin at Hook Coast.
Treasure #4
Given after winning the archery contest at Knothole Glade. Must complete Break the Siege Quest in Knothole Glade first.
Treasure #5
Found in a chest at Orchard Farm.
Treasure #6
Dig up the clue in a mound of dirt behind the windmill at Windmill Hill.
