Schroedinger's cat

Schroedinger's cat

     Releasing Schroedinger's Cat from a box which is being carried would
place the monster at the coordinates of wherever the box was last on the
floor instead of adjacent to the current location.

     Also, the message sequence

  The housecat inside the box is still alive!
  The large box is empty.

seemed a little strange.  This makes it say "is now empty" when a cat has
just been released.