Here are some definitions of productivity that could be used at Canada Post or anywhere:
Definition One: The degree of effectiveness of industrial management in utilizing the facilities for production ; especially : the effectiveness in utilizing labor and equipment.
Definition Two: Basically productivity is a measure of what one puts into something compared to what one gets out of it. You can usually get it down to a dollar value where if it costs more to employ a person, machine or process than you get out of it, there is no productivity.
It's always good to know how well or how badly your section is doing compared to others. We've never had a productivity meeting at the Toronto Exchange Office. Now is the time for one.