Remaining Treasure Vaults

What I Noticed in the game is that only 5 of the 8 ancient Treasure vaults are used in Vaults of the ancients. The achievement screen for the Xbox achievement: "Golden Retriever", shows there are 2 more keys for possibly two more vaults: One Being an Eagle totem, the other a sun totem. Also, there's no Crab totem vault key for the vault at Island N-13 for players who do a wayfinder voyage outside Tall tales