Castaway's Chest

The Castaway's Chest is a type of Treasure Chest in Sea of Thieves. Treasure Chests are locked with locks that can only be opened by Skeleton Keys held by Gold Hoarders on every Outpost. They are willing to buy these Chests for a fraction of their worth. You can also discover two other variants. The ashen castaway chest which is found in the Devil's Roar, and a shipwrecked castaways chest found in shipwrecks or in the shallows of small islands.

A Shipwrecked Castaway's Chest.

An Ashen Castaway's Chest.

Where to find

Castaway's Chests can be found from the following sources:

Chance to dig up from X Marks the Spot Maps received from Quests or Voyages
Chance to find inside Gold Hoarder Treasure Vaults
Chance to find hidden on Islands, excluding Outposts, Seaposts and Forts
Chance to find beached above or below the shorelines of Islands, excluding Outposts, Seaposts and Forts (Shipwrecked version)
Chance to find inside sunken Shipwrecks on the seas (Shipwrecked version)
Chance to find among Barrels of Plenty floating on the open Seas
Chance to find on Skeleton Ships (Shipwrecked version)
Chance to find inside completed Skeleton Fort Vaults
Possible reward for defeating a Kraken tentacle
Possible reward for defeating a Megalodon

Rewards

Castaway's Chests can be sold to:

Hoarders stationed at Gold Hoarders tents on Outposts for Gold and Gold Hoarders Reputation and Emissary Value (if sailing as a Gold Hoarders Emissary)
The Servant of the Flame at The Reaper's Hideout for Gold and Reaper's Bones Reputation and Emissary Value (if sailing as a Reaper's Bones Emissary)
The Sovereigns at the Sovereigns Hut on Outposts for Gold and Gold Hoarders Reputation and Emissary Value (if sailing as a Gold Hoarders Emissary)

The following is the reward chart for sold Castaway's Chests:

Emissary Grade	Gold (Min.)	Gold (Max.)	Emissary Value
No Emissary	60	130	0
I	60	130	300
II	79	172	399
III	100	217	501
IV	120	260	600
V	150	325	750

Notes

Picking up and placing Treasure Chests on a Ship for the first time gives Emissary Grade Reputation to Trading Company Emissaries representing the Gold Hoarders or Reaper's Bones.
Shipwrecked versions of Treasure Chests have the same value as regular Treasure Chests, but count for a different Gold Hoarders Commendation. The only difference is visual, only showing up as "Shipwrecked" when sold.
There is an Ashen version of this Chest, worth roughly double the regular Chest, which can be commonly uncovered from Ashen Treasure Maps or found in The Devil's Roar Region, but are not limited to these sources.
All Treasure Chests emit a White Glint from a distance.
Treasure Chests can be caught with a Harpoon.

Commendations

Commendations
Image	Commendation	Requirements	Rewards
	Hoarder of the Castaway's Gold	Sell 90 Castaway's Chests to the Gold Hoarders. Grade I: 5 Grade II: 15 Grade III: 30 Grade IV: 60 Grade V: 90	Rewards the Hoarder of the Castaway's Gold Title.
	Hoarder of Barnacled Gold	Sell 300 Shipwrecked Chests to the Gold Hoarders. Grade I: 5 Grade II: 20 Grade III: 60 Grade IV: 150 Grade V: 300	Rewards the Hoarder of Barnacled Gold Title. Unlocks The Silent Barnacle Set, Bristling Barnacle Set, Beard, Dipped Hair, and Tagged Hair of the Wailing Barnacle for purchase.
	Golden Tribute	Sell 600 Gold Hoarder Treasures while flying the Gold Hoarders Emissary Flag. High Seas only Grade I: 120 Grade II: 240 Grade III: 360 Grade IV: 480 Grade V: 600	n/a
	Eminent Hoarder	Sell 320 Gold Hoarder Treasures while flying a Grade 5 Gold Hoarders Emissary Flag. High Seas only Grade I: 60 Grade II: 120 Grade III: 200 Grade IV: 260 Grade V: 320	n/a
	Tributes Taken	Sell 480 Gold Hoarder Treasures to the Reaper's Bones. High Seas only Grade I: 60 Grade II: 120 Grade III: 240 Grade IV: 360 Grade V: 480	n/a
	Plundered Prizes	Sell 600 of any Trading Company items while flying the Reaper's Bones Emissary Flag. High Seas only Grade I: 120 Grade II: 240 Grade III: 360 Grade IV: 480 Grade V: 600	Unlocks the Dawn Hunter instruments for purchase at Grade I, the Dawn Hunter equipment for purchase at Grade II, the Dawn Hunter clothing and vanity for purchase at Grade III, the Dawn Hunter weapons for purchase at Grade IV, the Dawn Hunter ship set for purchase at Grade V.
	Fearless Reaper	Sell 320 of any Trading Company items while flying a Grade 5 Reaper's Bones Emissary Flag. High Seas only Grade I: 60 Grade II: 120 Grade III: 200 Grade IV: 240 Grade V: 320	n/a
	Legendary Gold Hoarder	Sell 500 Chests as a Pirate Legend High Seas only Grade I: 10 Grade II: 50 Grade III: 100 Grade IV: 250 Grade V: 500	Rewards the Legendary Gold Hoarder Title. Unlocks the Legendary Shovel and Legendary Compass for purchase.