cpqDaPhyDrvPathBoxOnConnector indicates which expansion box instance, on a given connector, a specific physical drive access path belongs to. This helps an admin physically locate which enclosure in a chain of daisy-chained boxes a particular redundant path runs through. For example, if a path's box-on-connector value points to the third box in a chain, the technician knows to inspect that specific enclosure's connection rather than the first one.