The FBI has not recovered human remains in its search of the house, spokeswoman Vicki Anderson said Friday. Agents removed more than 200 pieces of evidence, she added, declining to say what was found.
Berry and former captive Gina DeJesus, 22, went home with relatives Wednesday.
The AP does not usually name people alleging sexual assault without their consent, but the names of the three women were widely circulated by their families, the media and law enforcement for years.
A missing-person report on Knight filed one day after she disappeared in 2002 said without elaboration that she had a mental condition and was often confused about her surroundings.
Knight, now 32, was removed from a national missing persons database in 2003 after Cleveland police couldn't locate anyone to confirm whether she was still missing, based on police policy in such cases, the department said Friday.
"Despite this, Cleveland police kept Michelle Knight's missing person's case open and checked on the case numerous times," the city said Friday. "Records indicated Cleveland police checked on the case as recently as November."
Also Friday, the FBI said publicity surrounding the women's rescue had generated new tips in separate cases involving a 14-year-old girl and 18-year-old woman who disappeared years ago in the same area. FBI spokeswoman Vicki Anderson said the FBI was checking possible leads in the cases of Christina Adkins and Ashley Summers.
Adkins was 18 and pregnant when she was last seen Jan. 10, 1995. Ashley was 14 when last seen July 6, 2007.
Associated Press writers Meghan Barr, Mike Householder, Thomas J. Sheeran and Andrew Welsh-Huggins and AP freelance writer John Coyne in Cleveland; Brendan Farrington in Florida; and Dan Sewell in Cincinnati contributed to this report along with news researcher Rhonda Shafner in New York.