The Inland Valley Daily Bulletin ( http://bit.ly/XuUwu2) says Friday that police found several items in the backyard after several days of searching.
Sgt. David McBride declined to elaborate on the items found.
Authorities won't say what led them to the house. They're searching for 29-year-old Oscar Escobar, a truck driver from Laguna Hills.
He disappeared last August in Fontana after finishing a long-haul trip.
The home residents were questioned by police but not held.
The items found during the search will be sent to the San Bernardino County sheriff's crime lab.
Information from: Inland Valley Daily Bulletin, http://www.dailybulletin.com