I understand how heart breaking that must have been for you. But you have taken a step in the right direction - moving on...............
For all your pain, (and I had it too, years ago), I have now come to realise P's don't seen to hold onto anything. There is no sense of 'senimental value'. (Monetry value is of much greater importance to them)! My child has moved from pillar to post, 10 times or more in the last 6 years and he has left 1 item, at least at each place he's been. I still have things belonging to him. I don't think he will EVER be at a place where I can say, 'you're finally settled, I'll bring those thing round'.
Your child still exists. They are just NOT the child we thought we would have. Take comfort in the happy experiences you had with him when he was a child................................