I about died laughing over the toothbrush, but now the soap dish thingy? Sounds to me like he is moving back "home" little by little.
There was a woman who had a mlcer that was posting on this board many years ago...her mlcer took all of his stuff when he moved out. He was gone for several years and one day, when he came to visit the children, he brought an article of clothing w/him. When he left to go back to his "cave", he left the article of clothing. This behavior went on until almost all of his stuff was back home. At the end, he came home to visit and he told his wife that he was there to stay and you know what? I believe they are still together today and very happy.
So yeah, monitor those crazy little quirks an see what happens. It could be he's testing you to see if you will notice and say something. Don't mention it.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.