It took me 5 years to realize I could do this - RDR2

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Homestead Stash - Watson's Cabin
In Watson's Cabin, you find an old lady. Enter her house and use the ladder in the back to climb down into the cellar. Steal her semi-auto shotgun and leave. Return to the cabin the next day and you'll encounter the 4 sons of the old lady. Kill them all and a lockbox will now be available on the kitchen table that was previously not there. The lock box is the secret stash and contains 1 x $73.