The commission shall take reports from and may investigate the books and records kept by any pipeline carrier in connection with its business, and may require such company to make monthly reports duly verified under oath showing the total quantity of crude petroleum owned by such carrier and of that held by it in storage for others, and its unfilled storage capacity. No publicity shall be given by the commission to the reports as to stock of crude petroleum of any particular pipeline, but it may make public the aggregate amounts held by all the pipelines making such reports and their aggregate storage capacity.