How might I use it?

Let us say that you were concerned that one particular carrier service was scanning in parcels infrequently (as highlighted by the Data Quality Dashboard).

You Keep Only that carrier service, select 'Yes' for Scanned into Carrier Network, and view the volumes for the different time periods:

You see that the carrier has only been scanning parcels into the network on one day of the month. This allows you to quantify your findings to the relevant carrier.