I waited four hours for loading/unloading today. How should I keep evidence of detention to make it easier to claim?

A shipment arrived at the warehouse today and waited four hours for a dock. The driver only sent a message in the group saying 'not unloaded yet.' This kind of record makes it very difficult to claim detention from the broker later. I had the driver provide the arrival geofence time, the check-in slip, the dock assignment time, a photo of the BOL signed upon completion of unloading, and a…