Boswell was last seen in December 2019, but she was not reported missing until February.
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WJHL reports TBI and detectives with the Sullivan County Sheriff's Office searched a property belonging to a family member of Evelyn's mother, Megan Boswell, in northeast Tennessee.
Authorities said they found the possible remains of the 15-month old there.
WATCH: Tenn. Bureau of Investigation gives briefing after remains believed to be Evelyn Boswell found
Tenn. Bureau of Investigation gives briefing after remains believed to be Evelyn Boswell found
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"At this time, the investigation is still in the very early stages," Sullivan County Sheriff Jeff Cassidy said during a news conference Friday night. "There is a lot of work left to be done."
The TBI said an autopsy is pending and the investigation is ongoing.
In late February, investigators searched a mobile home park in Sullivan County, Tennesee, in connection with her disappearance.
A few days before, authorities searched a pond in Wilkesboro, North Carolina. That search proved "inconclusive."