Jimmy contacted Mckenzi Remy, asking to return to the scene for another look. Previously, because of the body, he had only checked the corpse and had not inspected the ruins; this time, he intended to activate Heart Eye and conduct a thorough investigation of the objects beneath the remains of the house.
As expected, there was a problem. In a spot that should have been the attic, he found a box containing what seemed to be various bones. Since the imagery was in black and white lines, he wasn't certain of what they were, but since the box was buried under the rubble, he couldn't directly tell others there was something there. Although the pile of bones appeared unusual, it likely had nothing to do with the murder case at hand.
Jimmy continued to search other areas and discovered an underground space, but from the looks of it, the contents seemed to have been removed beforehand; it was an intact square space.