In the chest you find a scroll.

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"There are tales of caverns of great wealth. During my time on the run I hid in the forest across the river from the farm. I found a cave there, and I'm sure it's the same one the legend speaks of. I was afraid to venture into it as a youth, but I have a mind to explore it now. If I go I'll need be armed to the teeth, with plenty of torches and food."

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You also find a letter.

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"We best be thinking about getting a reinforced door to the cellar. If a patron were to stumble down there and find the secret sewer entrance, they might try to blackmail us, or worse call upon the Captain. I told you this was risky business, but we've got to have a proper hideout right?"