During questioning after his arrest, Knight said that the last verbal contact he had with another person was during the 1990s, Vance said.
"He passed somebody on a trail and just exchanged a common greeting of hello and that was the only conversation or human contact he's had since he went into the woods in 1986," Vance said.
The trooper said that the case of the North Pond hermit sometimes seemed a "myth" that might go unsolved and bringing it to a conclusion is "amazing."
"I think it's still sinking in," Vance said. "I don't think I will ever be involved in such an incident or case it this magnitude."
Knight had been charged only with the Pine Tree Camp burglary, in which $238 worth of goods were taken, and was being held at the jail on $5,000 bail on burglary and theft charges.
Knight had attended a high school in Fairfield, about 20 miles away.
Why he decided to disappear in the woods remained a question on Wednesday.