"It's very possible that he could have known her, could have known her daily routine. We're following up on everything we possibly can," said Decatur County Sheriff Roy Wyatt.
"As long as we keep our faith that she is alive," said Wyatt, the search will continue.
The army of volunteers searched for Bobo on foot, on horseback and using ATVS.
"Holly I love you so much. Please try to get home to us and if anybody knows anything about her please, please help us find her," said Karen Bobo, Holly's mother.
Pink ribbons and pictures of Holly Bobo are posted all over the close knit community of 2,500 people.
"If this was my daughter, I'd want everybody doing the exact same thing for her," one volunteer said.
"She was a really good person who i never would have dreamed this would happen to," said friend Felicia Tegethoff. "She didn't need it to happen to her she was doing something with her life you know."
The community is offering a $25,000 reward for any information that leads to Holly Bobo's safe return.
"If there's anybody that can help, just come on and help us please," said Natalie Bobo, Holly Bobo's cousin.
Bobo is 5-feet-3 and weighs 110 pounds. She was last seen wearing a pink shirt and blue jeans.