"She opened it herself" on April 11 and told Holland about it three days later, Holland said.
He said she had not been to the doctor, but he planned to take her Thursday.
"She's fine," Holland said. "She's had no symptoms."
Curtis' neighbors, who said he did not seem violent, were concerned about their safety Thursday and worried by the idea that someone was making poison in a house that sits so close to their bedrooms and front yards. The one-story, single-family home is similar to the others in the neighborhood — red brick with white trim.
A church, and a community center with an outdoor children's play area, are just steps from Curtis' house. The home also is near an area with several mailboxes for the community. But neighbors said they rarely saw him retrieve mail and didn't speak with him much.
"He was quiet. He pretty much stayed to himself," said neighbor Lacey Ross, 29.
Next-door neighbor Kayla Latch, 18, lives with her mother and her two brothers and said they were worried that toxic chemicals could be released when investigators enter the home.
Latch said Curtis lived with a woman and teenage boy when he first moved in, but they appeared to have moved out.
Kayla Latch said she slept in the living room Wednesday night.
"I'm still a little scared because my room is right next to his house," Latch said. "I didn't even sleep in my bed."
Latch's mother, Melissa Strickland, two men who identified themselves as being with the FBI came to her house Thursday and asked about the man next door. She said they never identified Curtis by name.
"They asked me if I saw a lot of people coming and going from his house," she said. "I told them, "No."