Those were originally part of a Chevrolet monthly communication kit.Corporate sent these cardboard boxes out to dealerships that subscribed to em,every month,to inform them what was going on with the product line.A dealerships salesmen would all sit down together & watch the film & record in a room at the same time.Then have a meeting to discuss the details afterwards,of what was new & possible.It gave the salesmen knowledge to answer the customers questions.Not every dealership subscribed to them,so they can be harder to find in certain areas.