"I have even tried searching through the filesystem for Trash and harry's Home but can't find them."
I have not upgraded to gnome 2.4 yet. I understand that the gnome long range strategy is to do as much configuration as possible with XML files. So if Trash and harry's home are not on the file tree then my guess would be that gnome has defined them using XML in some config file and then somehow sets them up at initialization time. Just a guess. If that guess is correct then you should be able to delete them using one of the many gnome configuration programs (or perhaps gnome 2.4 consolidated the config progams, I don't know)
Be prepared. Create a LifeBoat CD.