The receipt, found in a box of Kimball's belongings. (Courtesy of Lafayette police)

The receipt, found in a box of Kimball's belongings. (Courtesy of Lafayette police)

Nagged by a $17.95 grocery store receipt found in Scott Kimball’s possessions, FBI Special Agent Jonathan Grusing decides to take a closer look around Walden, Colo.

The receipt — dated Aug. 24, 2003, one day after the disappearance of Kaysi McLeod. — came from the North Park Supers store in the tiny northern Colorado mountain town.

Scott Kimball, who said he was alone in the mountains the day Kaysi disappeared, had later told Grusing that she might have overdosed on drugs somewhere on national forest land.

Grusing calls the Routt National Forest district office in Walden to ask for a map of the area, and a receptionist tells him it costs $8.

In no mood to fill out an expense sheet, Grusing asks to talk to someone higher up the chain of command.

He tells supervisor Sue Yeager he’s with the FBI and is searching for human remains. She says she’ll get some maps out right away.

Then, almost as an afterthought, she tells him to talk to the coroner. A skull, likely belonging to a young female, had been discovered by a hunter six months earlier in a remote area southwest of town.

“When she told me that, I pretty much knew it was Kaysi,” Grusing recalls.

An initial DNA analysis 2 1/2 weeks later will point to the same conclusion.