Can also confirm that when we went to Mulsanne on Sunday at about 11 am we did not have a pass and absolutely nobody cared. Pretty much every car was without pass.
Guess they might be pretty hot at the start for the passes but don't expect it lasts.
We got stung at Mulsanne corner for a parking ticket on the Saturday morning when we went down to watch the Porker and Group C support races. But we didn't venture down to Arnage or Mulsanne again so no idea how hot they were on checking them later in the weekend.