I so know how you feel Kiwi. Like FS, I think we are also in similar sitchs with our H's moved out or in the process of moving out and being so nice to us. In some ways, I think it would be easier if my H was not nice. Easier for me to let him go.
There are still a lot of his things in our house but I have started to move his belongings aside to make more room for mine. If he notices, he hasn't said anything. He recently took his electric toothbrush which had been in our bathroom for six weeks. Don't know why but that really bothered me. Other things he has taken are items I might not have noticed if I hadn't been looking for them. When he takes something he thinks I will notice, he asks first. All in all, he has been very respectful and kind - more so then when he was living here when he basically just ignored me.
Ironically, my H sees more of our kids now than when he did when he was living with us. We have also talked more in the last seven weeks than we did in the last eight months. Tomorrow he is coming for dinner (mostly because it is convenient) and we are taking the kids trick or treating. Since there have been no permanent decisions made (and honestly I don't think he will make one unless I push it), we agreed that once in awhile it is good for our kids to spend time with us together - especially on special occasions like Hallowe'en, Christmas, birthdays, etc...
I am lucky in that my H found his place and secretly moved some of his things before I knew about it so, in a sense, the bandaid was ripped off pretty quickly once I was in the know and he could just go there without having to pretend anymore. I really feel for you having to have this move out day to "look forward" to. For me, it was the opposite with a number of "move back" days coming and going until I realized he was nowhere ready to return and if he did so, it would only be out of guilt and nothing more. As FS pointed out... his heart is in a box and he only really takes it out when he is with the kids. It is no longer accessible to me or to anyone else, for that matter.
Anyway... I wanted you to know that I am thinking of you and you are not alone. This is a crazy reality we are living in. Keep posting. (((HUGS)))