I let him roam in my kitchen during the day and leave him in the cardboard box at night. Today he actually started walking all around the kitchen and looking at the drawers while flexing his wings from time to time. His eyes look way clearer and he's more active. The droppings are the same thoughAre the droppings improving? He sounds more active. Get a very large cardboard box (maybe a supermarket will have one), turn this on the side with the open part to the front. Cover the open part with chicken wire or any mesh that will allow light inside the box. Line the bottom with a couple of newspapers and put a brick inside for him to perch on. Every morning you can just remove the top layer of newspaper with the droppings on. Much easier for both of you.
Also provide him with seeds and water. He might start eating by himself.
You can put the box on a table, they feel safer when off the ground.