Question: destiny 2 how to unlock box?
Answer: Fishhook key. After the first round at the Volundr Forge, send one player in your Fireteam over to the cliff side and one to the cave area. ... 
Hand key. You can also open the Hand lock by completing a similar set of actions at the Gofannon Forge. ... 
Butterfly key. ... 
Black Armory key. ... 
Last Souvenir quest.