I dont have the original MS remote - I think its a clone, but all the buttons work fine though XBMC. I dont have a storage scope either. I might try and build the circuit from lirc and see if I can display the codes.
can you borrow a real xbox remote ?
I wonder if the clone Ir receiver you have pluged into your xbox will work with the real controler if it does not how could you expect the pic code to work ?