I did some googling to see if I could find helpful tips about grieving birds, and found a site where an owner had this to say about her bird who was grieving the loss of his cage mate. I wonder if it would help Max:

"What do you think of me moving him back to his original cage? Do you think the huge one he's in might be too overwhelming? His original is 24x24 and the one he is in is 42x30. I wonder if a smaller space might make him feel more secure in the interim?"

Cathy