A warranty on a microwave oven led Snohomish County sheriff’s detectives to search the house of an Everett man in connection with the death of a woman.

Investigators searched the man’s home and seized his truck earlier this week as part of their investigation into human remains found in June off a gravel road east of Granite Falls. No arrests have been made.

The man, 44, is cooperating with investigators, sheriff’s spokesman Rich Niebusch said Friday. Detectives will not say whether the man is considered a suspect.

A search warrant filed in Everett District Court on Friday details how detectives found an empty cardboard microwave box near the woman’s body and traced it back to the man.

Investigators determined that the Maytag appliance was bought at a local hardware store in February, and the customer applied for a warranty with the manufacturer.

The information led police to the man’s Everett house, where investigators questioned him. The man told detectives he had installed the microwave oven and then chopped up the box and recycled it, according to the search warrant.

While at the man’s home, investigators also noted that the man had recently installed a new vinyl kitchen floor that required adhesive to glue it down. Detectives also recovered a can of floor glue near the body, according to the search warrant.

Investigators learned that a U.S. Forest Service officer had cited the man in February for illegally dumping garbage about 30 to 50 feet from where the woman’s body was found.

The officer told detectives the man initially tried to hide behind a tree. The officer found a toolbox, some pipe fittings and an orange duffel bag behind the tree, court documents say.

The officer told the man to remove the items. According to the search warrant, the man asked if he had to pick up any additional garbage, motioning to the area where the body was later discovered. He told the officer that he hadn’t dumped anything there, and the officer didn’t search the area, according to the warrant.

A man and woman who were out looking for shell casings spotted the woman’s body June 11 under a small plastic swimming pool and a microwave box.

So far, detectives have been unable to determine how the woman died. The Snohomish County Medical Examiner’s Office is doing additional tests, Niebusch said.

Investigators also haven’t been able to identify the woman. A search of a national database for missing people hasn’t turned up any leads, Niebusch said.

Police are asking for the public’s help to identify the woman.

An autopsy revealed the woman had extensive dental work, and had several healed fractures to her ribs, right wrist, vertebrae and right ankle. She may have suffered those injuries in a car accident, Niebusch said.

The woman was white, between the ages of 30 and 60, and 5 feet to 5 feet 5 inches tall.

She was wearing a Jennifer Moore-brand white, button-up, short-sleeved shirt with a floral pattern. There was a large pin similar to a safety pin on the shirt.

She also was wearing Willow Bay brand dark-colored sweat pants, size 10 to 12 tall, with an elastic waistband, and gray insulated high-top hiking-style shoes with tennis shoe soles and three Velcro closures on each shoe.

The body was found about 40 yards from a gravel road off the Mount Loop Highway that leads to the popular Mount Pilchuck lookout trail.

Reporter Diana Hefley: 425-339-3463; hefley@heraldnet.com.