Emry, Kaysi McLeod, Jennifer Marcum and Terry Kimball were all last seen with Scott Kimball in 2003 and 2004.All four are from the Denver area.
McLeod's remains were recovered in a remote area of Jackson County in June. Hunters first discovered the remains last fall.
The FBI searched Kimball's former home in Adams County earlier this month.
Agents will not say what they found during the search.
Kimball is in jail on unrelated charges and has not been charged in the disappearances.If you know Scott Kimball or have a tip for investigative reporter Jace Larson, e-mail him at email@example.com.