Sorry - you must have posted as I was typing.

Add to the IEP that ALL worksheets will be sent home. Every minute of his day is to be accounted for. Major PITA for the teachers but if evidence is being "disappeared" it's a legitimate request. When they balk at this present it as being done for their benefit. Afterall you and DS both hallucinate -right? If they can document every minute of every day you can't claim things are missing now can you?