x1 in the Slaver Caverns during Wayward Son, in the back of the cave up on the platform in the room where you first fight the slavers.
x1 at Sundermount, in the graveyard just before the altar on the mountain path
x1 in the Bone Pit Mine during The Bone Pit (quest), up the first set of stairs after killing the third group of dragonlings.
x2 in the Deep Roads during The Deep Roads Expedition, one tucked in to the left side of the stairs in the first room, one to the left of the entrance of the second room (where you fight the Emissary).
x1 in the Varterral Hunting Ground during Mirror Image, on the last plateau before the varterral. The cut-scene interrupts forward movement just before you reach it, so you need to pick this up after the fight.