Bridge inspection files must be securely transferred to local government bridge owners. Acceptable methods to transfer bridge inspection files are Box.com password protected zip files or password protected jump drives. District Bridge Inspection Coordinators shall retain records of transmittal and record of receipt of bridge inspection files. Thumb drives can by physically signed for when handed over. If mailed, that should be done with certified mail as proof of delivery from the Post Office or other carriers with signature-required delivery.