Unfortunately, setting the properties to get the correct labels to show up using the MessageProcessor has been somewhat of a point of confusion
... the Github repo that hosts this data attempts to clarify this
I believe those properties names listed there have only been tested using the latest version so hopefully these will also match your version of the software. I *think* the only thing that changed from version to version was in older versions Case/Capitalization was not significant and in the newer versions the casing of the properties do matter.