A $50,000 reward has yielded no new information about a southeast Kansas boy who has been missing since 1999.

An anonymous donor put up the reward in late December in an effort to solve the disappearance of 11-year-old Adam Herrman, who was last seen at his family’s home in Towanda.

Butler County Sheriff Kelly Herzet says by late Monday, only about a half-dozen people had called and none of those calls brought in any new clues in the case.

Adam’s parents say he ran away from home. His disappearance was not reported until 2008, when Adam’s sister contacted law enforcement. The parents claimed they didn’t report him missing because they were afraid their other children would be taken away.

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Associated Press information from: The Wichita Eagle