The Brass Shod Chest has a 24h cooldown, like the ones in Cobra Bastion, therefore it is possible to do the mission before the cooldown on the chest has been reset. The Dragon Chest should be once per char type thing. A friend of mine has received 3 figurines. The soulscourge from the Dragon Chest completing the quest, then received the snowbash figurine from the Brass Shod Chest on our first journey. The 2nd time we completed the journey successfully he received the Mossmasher figurine from the brass shod chest and was unable to open the Dragon Chest. I added the screenshot a friend took when we completed the quest. I got 2 figurines from that run. I didn't take my own screenshot. But it is 100% possible to get more than one figurine. The bug that was in place was that people could use the Dragon Chest more than once.