Investigators earlier said they're looking for people who may have seen the truck in late January and early February near the midtown Anchorage coffee shack where Koenig worked and in other locations.
The truck was equipped with green tool boxes that run the length of the box on each side. It also was photographed with a rack over the box, but the truck may have been driven without it, investigators said. It may have been off the truck at the time of the incident, the FBI said last week.
Keyes likely would have needed help moving the rack on or off the truck, and investigators would like to speak to anyone who may have assisted him.
The Keyes Construction website says the company offers "foundations to finish work." Rates were $35 an hour during the winter, $40 an hour during the summer.
It says Keyes worked in Washington state from 1995 to 1997, served in the Army for three years, and from 2001 to 2007 worked for the Makah Tribal Council in Neah Bay, Wash., and received a commendation letter for his work in the parks and rec department. He started his Alaska business in 2007.
Associated Press writer Kathy McCarthy contributed to this report from Seattle.
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