What does The Captain's Chest reward?

The Captain's Chest gives a choice of Bloodband Bracers, Freebooter's Armband, 3,150 experience.

Where does The Captain's Chest start?

Captain Hecklebury Smotts in Stranglethorn Vale offers it.

Its level has not been recorded yet; it shows once a player accepts it with the addon running.

No. The quest exists in Classic Era as well.

World of Warcraft: Forever · quest

A quest in World of Warcraft: Forever, offered by Captain Hecklebury Smotts in Stranglethorn Vale. Recorded by 2 players running the addon.

Level and objectives show once a player with the addon accepts the quest.

Item	Given	Item level	Vendor sell
Bloodband Bracers	as a choice	47	35s 63c
Freebooter's Armband	as a choice	47	48s 55c

What does The Captain's Chest reward?: The Captain's Chest gives a choice of Bloodband Bracers, Freebooter's Armband, 3,150 experience.
Where does The Captain's Chest start?: Captain Hecklebury Smotts in Stranglethorn Vale offers it.
What level is The Captain's Chest?: Its level has not been recorded yet; it shows once a player accepts it with the addon running.
Is The Captain's Chest new in WoW Forever?: No. The quest exists in Classic Era as well.

Source: what players running the addon saw in the quest windows; the quest text itself stays in the game. Every quest seen · Stranglethorn Vale