Let us say that you were concerned about the number of parcels being returned from a particular market. You could use the Returns Activated report to verify the actual figures.
You would select the required market under the origin warehouse, and keep only that 'trade lane':
The Activated/Outbound figure tells you that over 9,000 parcels, equating to almost 8% of of those that were despatched, have been actively returned to you during the Manifest Date Range: