If you need to audit which of your workflows have run and contained enterprise workflow actions, then you can run this script against your Nintex Content DB:
Select distinct WorkflowName, CurrentActivityTitle, ListID, SiteID, WebID from WorkflowInstance wi inner join WorkflowProgress wp on wi .InstanceID = wp . InstanceID inner join <Nintex Workflow ConfigDB>.dbo.Activities Ac on CurrentActivityTitle = ActivityName where RequiredFeatureSet = 100
Replace the <Nintex Workflow ConfigDB> with the name of your Nintex Config DB.
This script will need to be run against all of your Nintex Contents, and will only return those workflows that have been run at least 1.
If you want to look for specific actions you can use:
Select Distinct I.WorkflowName, P.CurrentActivityTitle, I.ListID, I.SiteID, I.WebID From dbo.WorkflowProgress P inner Join dbo.WorkflowInstance I ON P.InstanceID = I.InstanceID Where P.CurrentActivityTitle Like 'Call Web Service' Or P.CurrentActivityTitle Like 'Copy to SharePoint'
Replace the action names as required.