I have been sent this and can not varify if true or force but better to be safe than sorry.
WARNING TO PET OWNERS ABOUT AMAZON CARDBOARD BOXES
Amazon sprays ALL boxes with Toxic Pesticides to kill warehouse rodents!
If your pets play in Amazon Boxes they will be exposed and may experience chemical burns to the tongue. Other symptoms include: fever, lethargic movement, shallow breathing, and sticky salivation. Emergency medical intervention will be necessary, in all cases, to prevent certain death.
Keep Amazon Boxes far away from your beloved pets and WASH your hands anytime you handle any Amazon boxes and/or product wrappings.