Heroes of the Aturi Cluster dockingbay416.com/campaign
The purple/gold treasure chests on 1" circles are Treasure/Gold Hoard markers for use with specific quests, or theorietically, the rewards on combined tiles. I think they only show up in the 1.0 story quests.
The little treasure boxes are a mystery to me as they haven't shown up in any of the traps or quests that I've done yet, so I'm sure someone else will mention them.
The little 0.5" treasure boxes are supposed to be placed on the Darkness Board, to keep track of the treasure limit of your current tile. Whenever Treasure drops (when you kill 3 minions in one attack, or a captain/miniboss/lair), place one of these on the board for characters to pick up and thereby draw from the treasure bag. My group doesn't like them though because they're tiny, so we use an alternate.