As I said, 'the form was filled out by hand by the Manufacturing Manager to communicate production schedules to his staff and resided in his personal folder'.
A document on a personal drive may not be under control. The problem is just that people may leave the company. Refer to ISO 9001 7.5.3.2 For the control of documented information, the organisation shall address the following activities, as applicable: a) distribution, access, retrieval, and use.
I've also seen uncontrolled electronic documents getting lost and the only hardcopy gradually fading into illegibility. Refer to ISO 9001 7.5.3.2 b) storage and preservation, including preservation of legibility.