Maddie may know more, but it seems to have something to do with the aurors. Nora came home to find him gone, signs of a struggle and a note attached to one of the puffskeins “Make sure the ’Aurors‘ are watching.” And I’m sure you’ve seen the hooter.
His wand and phone are gone, but they left his crutches. I have no idea how they found them, they were staying at his brother’s but very few people knew that.