Hi, well, i think, it's not a good idea to re-use the same user with multiple persons.... I don't know if ezPublish should support this.
If your object do not have a node id, then they are not accessible through the normal browsing. Excepion: Drafts. But you say, they are not there, too.
Maybe these are old versions of objects? Did you loose the objects from the "content node tree" completly? Did you check the trashcan?