The last four items are available to loot! 2 more in Diessa and 2 more in Wayfarer. These include the Refugees Compass, Ship in a Bottle, Sword Belt and Log Book.
The items are in similar 'shinies', 'dirt covered object' and 'snow covered object' through the areas. Diessa has 11 spawn locations while Wayfarer has 13.
Video guide with maps: