Keep pushing for the teacher to use the book.
My daughter has had a communication book since she was in early ed (2yrs old) and she is now 15yrs. I have always insisted on the teacher using it and they have never had any problems. It is essential especially for kids who cant express themselves enough to say if there are any problems, good achievments, etc and then there is always the keeping in the loop about appointments, equipment needs, therepists communication, etc.

Good Luck Maz.

Sjl