When you try to export all Agent to CSV, it cuts off after 30,000 rows.
How to change the export limit of System Summary Reports Export All CSV file?
The maximum number of Agents allowed to export, print or mail from Agents Summary Report or Agents Legacy Summary Report is incomplete
System -> Agents -> Overview -> Summary Reports -> Export All:CSV
When trying to export the total number of agents that a DLP system has in DLP (versions 12.5 - 15.8) to a file from the Agent Summary Report in the Enforce console the default limit is set to 30,000.