Steal the jewellery box that just fell from a second-storey window

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However, a replicated version can be found at Steal the jewellery box that just fell from a second-storey window (The Waswood).
Box2.png
Spoiler warning!
This page contains details about Fallen London Actions.

From: The Stone Pigs Awaken


The entire building is leaning over, disgorging the contents of rooms like the aftermath of a bad night of drinking.


Success

Well caught

You manage to snatch it from the air just before it falls into the widening chasm. With the owners otherwise preoccupied, you can help yourself to its contents.

But these cracks and chasms continue to slowly widen. What is happening to London?