Is there an industry standard for checking and reporting faults with paper stocks?
There appears to be no standard as such laid down for the industry. As part of Best Practice, most printers today use up paper stocks within days, so this issue should not arise. We would advise a review of your stock management, including establishing routine checks on any long-term stock. This is usually for special makings where consistency of shade, bulk, etc are essential, such as for, say, journals production.