(CNN) For years Matthew and Maria Colonna-Emanuel thought a piece of rusty metal behind some trees in their backyard was just part of a cable or electrical box.
But it wasn't. It was a safe containing $52,000 in cash, gold and diamonds. And the story of how they discovered it -- and what the couple did next -- is remarkable.
The couple saw the metal box between some trees when they moved in to their Staten Island home in New York, but never paid much attention to it.
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"I thought it was an electrical box," Matthew Colonna-Emanuel told CNN affiliate WCBS.