     if returnInfoDiffs
       # iterate over returnInfo instances
       _.each _.keys(returnInfoDiffs), (returnInfoIndex) ->
-        if returnInfoIndex != '_t'
+        if returnInfoIndex isnt '_t'
           returnInfoDiff = returnInfoDiffs[returnInfoIndex]
           if _.isArray returnInfoDiff
             # returnInfo was added

            returnInfo = returnInfoDiff
            # iterate over returnInfo items instances
            _.each _.keys(returnInfo.items), (returnInfoItemIndex) ->
              if returnInfoItemIndex != '_t'
                returnInfoItem = returnInfo.items[returnInfoItemIndex]
                # iterate over all returnInfo status actions
                _.each actionsListReturnInfoState(), (actionDefinition) ->

          else
            # iterate over parcel instances
            _.each _.keys(deliveryDiff.parcels), (parcelIndex) ->
              if parcelIndex  isnt '_t'
                parcelDiff = deliveryDiff.parcels[parcelIndex]

                if _.isArray parcelDiff
