Set a date. You have until ______. And then if he doesnt come get his stuff, you really do get rid of it. I would just have the locks changed.
When you set boundaries, they only work if you are ready to enforce them. If you set a boundary and are not ready to enforce it, it wont look very good for you.
Dont pursue it, or try to pressure him, these boundaries are about you, and if YOU need something, you dont wait for someone else to do it for you, you just do it. Tell him what your going to do, and do it.
If you want him there for the birth of your son, then go ahead and tell him that. IMO, its probably not a good idea to try to exclude him from that, after all, it is his child. But- that is ONLY your choice. Does he even want to be there?
I guess I gave the wrong finger to the wrong man...