Well if you are talking about going between two EUO scripts, you would want to make yourself a global variable. (Atleast this is what i have done).
So in your drag drop
Finditem XXX G_5
  set *dragging #true
  for #findindex 1 #findcnt
  {
    Exevent drag #findid
    wait 10
    Exevent dropc %box2
    wait 20
  }
  set *dragging #false
Now all you need to do is make a check for whether *dragging is #true in your movement sub