Robert, We have a hidden trick that restores *all* past starters and leavers into view on the internet movements form (You'll have to exclude most of them again after doing this). We put this ability into the software specifically for the situation that you find yourself in.
What you do is hold the Alt and Shift keys down both at once, then click the "Exclude All" button on that form. You should see all movements come back into view when you do that.