Frederick M. Cook, 69, was last seen about 7:15 a.m. on August 21, 1990, while finishing a shift at the city landfill in Grand Island, Nebraska. His vehicle and personal effects — including clothing, a silver digital watch and a black billfold with a gold ornament — were left on site, and coworkers raised the alarm when he could not be found.

A search of the landfill began immediately and expanded into the surrounding corn and milo fields; operations at the landfill were halted while workers and authorities combed the garbage pile. Nothing of Cook’s was recovered, and despite months of searching and an open case file at the Hall County Sheriff’s Office, no trace of him has been found.

Authorities do not suspect foul play and the prevailing theory is that he was accidentally buried in the landfill, but the disappearance remains unresolved. Does anyone who worked at the landfill in 1990 or who searched the area have information that could help close this case?