When Kate and Charlie Johnson moved into their 1920s red-brick colonial in a leafy Boston suburb 10 years ago, the attic, the basement, and the garage were empty. Slowly and inevitably, Kate, a stay-at-home mom, and Charlie, a software developer, filled those spaces with old toys, furniture, and sports equipment. To help them make the most of forgotten treasures and refresh their child-friendly rooms, Real Simple sent them on an at-home scavenger hunt. Once the dust settled, they were amazed at what they found.