Law enforcement is preparing to return Nancy Guthrie’s Arizona home to her family as the search for the 84-year-old mother of Savannah Guthrie enters its fourth week.

Guthrie was last seen on January 31 in the Tucson area, and authorities have collected DNA evidence from her home, though testing has so far yielded no conclusive results.

Over 23,000 tips have been submitted to the FBI, including 750 within 12 hours of Savannah Guthrie offering a $1 million reward.

FBI footage shows a masked, armed person outside Guthrie’s home, though questions remain about the timing of one image showing the suspect without a backpack, NBC News has reported.

Officials continue to pursue all viable leads, with no suspect identified in her possible abduction.