Just what is in the box?

From Fallen London Wiki
A player-created Guide is available for this content: A Boxful of Intrigue (Guide)

How are the above links here?

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This page contains details about Fallen London Actions.
Each of the seven locks is more complex and subtle than the last. But surely investigation will yield some information?

Unlocked with A Survivor of the Affair of the Box exactly 2, 1 x A Heavy Iron Box

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Investigating the mysterious box