The dive team searched near the dam at Vallecito Reservoir on Sunday for missing 13-year-old Dylan Redwine, the Durango (Colo.) Herald reported.
Redwine was reported missing from his father's home in Vallecito on Nov. 19.
A postal worker who knows Redwine reported seeing two teenage boys -- one who looked exactly like Redwine, La Plata County Sheriff's Office spokesman Dan Bender said. Investigators are now trying to locate those boys, Bender said.
La Plata County Sheriff's Office is "working with local representatives of the FBI to share information and resources as they continue to develop leads on where Dylan may be," Bender said in a news release.
"Scenarios from abduction to runaway are being examined," the release said. "Without any new clues, we have to continue to consider any and all possibilities, he said.