Abstract: Difficulties have heretofore been encountered by having unscrupulous persons open containers used to package pills and other medicinal products, prior to the sale to the ultimate customer, and substitute or place in the container poisonous substances which have on occasion resulted in the death of users of the medicinal products. This invention is directed to the provision of a closure member having relatively movable cap members operable when the cap is moved to the container opening position to permanently display an indicator showing that the container has been opened. The ultimate purchaser can thus be protected from purchasing a container which had been opened after being packaged at the factory where the medicinal supplies originated.