Prosecutors say the men cut off Ms Spence's head and attempted to cover up their crimes by bleaching floors, pulling up carpets and laying new floorboards. They believe she was held between April 14 and 28, 2011.
At the High Court in Glasgow, the jury heard from detective sergeant Aileen Boyle, from Strathclyde Police, who was appointed the crime scene manager for part of a search of a property at Meadowfoot Road, West Kilbride, where prosecutors say Ms Spence was held.
Officers were looking for a number of items, including body parts, blood, teeth, hair, cleaning products, weapons, carpets and any sharp cutting equipment, Ms Boyle said. The jury was shown images of the property, including an aerial shot and 360-degree pictures of the street outside, and front and back gardens, where there was a considerable amount of rubbish and debris.
Ms Boyle said a green bag with a label for chipboard floorboard pieces was taken away for further investigation during a search on November 7, as well as a mop head and a bag with some nails. The items were traced to a B&Q sales transaction on May 25.
Parker, Smith, Wade and Coats deny 26 charges against them.