Add some shredded up cheap white loo roll as well. Also cheap enrichment that they enjoy is loo roll tubes, kitchen roll tubes, boxes with little doors cut in them and the bottom removed. That looks a decent sized box
Good for you in seeing to them. Up the handling time and weigh them weekly to see how they are growing. It's often the bully who takes the separation worst and they can take 10 days or so to adjust. They may appear a little quiet and hide a lot but stick with the handling. Watch the wounds are healing well too.