This invention relates to a method and system for authenticating and for preventing alteration of histories of events occurring within at least one repository (e.g. a cargo container, fixed warehouse or a movable vehicle) for objects (e.g. auto parts, pharmaceutical materials, computer parts, laptops, etc.) held for a period of time, where the repository is exposed to an unauthorized intrusion therewithin (and potential theft of said objects therefrom and potential insertion of dangerous items therewithin). The events include changes in environmental conditions (e.g. light levels, infrared levels, temperature, air pressure, etc) which indicate an unauthorized intrusion.