Also got pointed to this discussion by our sales engineer.

https://community.intersystems.com/post/developing-operational-analytics-dashboards
 

Thanks Roger!

So I found that I have the messagebodyid from the Request (From_UTDHC_Unzip to From_UTDHC_Router) that I could use to go back to message 1288157  and  get the corresponding message id of 1288161 and then use that to check the MessageBodyId field to see if it is a list and spin through all of those.  But is that the most efficient?