Couldn't find the thread so I will post my settings below.
Basically you want to "Add Library View" (from 'Right Click' on Audio group).
I prefer the "Pain" view but I am sure it will work with any view type you prefer.
I named my view "Not Analyzed"
Then 'Right Click' the view and select "Customize View". See result below. Mine might look a bit different if you are not using the "Panes" option.
Click on "set rules for display" which should get you something like this:
On the left side you want to select the field "Peak Level (R128)" and then "is" - "<empty>
That should result in tracks whose "R128" field is "Empty" meaning it hasn't yet been analyzed.
Hope that helps.
Carl.