Agents discovered a human skeleton wrapped in a tarp on Monday night.
They were pointed to the site in East Farmingdale by an informant.
Investigators are looking for the remains of 21-year-old college student Carmine Gargano Jr. and two Colombo crime family members -- Colombo family associate Ralph Greaves and Colombo family underboss William "Wild Bill" Cutolo.
Agents plan to continue digging at the site.
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