PRIVATE SEARCH TEAMS -- WITH CADAVER DOGS -- PLAN TO COMB OVER THE FORMER SEATTLE-AREA HOME OF SUSAN COX POWELL'S FATHER-IN-LAW, STEVEN POWELL.

THEY'LL BE LOOKING FOR REMAINS OF THE WEST VALLEY CITY MOTHER, WHO'S NOW BEEN MISSING NEARLY 4-AND-A-HALF YEARS.

THE HOME -- OF THE CONVICTED VOYEUR -- WAS RECENTLY AUCTIONED OFF.

SUSAN DISAPPEARED -- FROM HER WEST VALLEY CITY HOME -- IN DECEMBER 2009.

HER HUSBAND, JOSH POWELL -- AND THEIR TWO SONS -- DIED IN A FIERY MURDER-SUICIDE, IN FEBRUARY 2012.