If you get 5 'cards' each time you lap the course, and it was certainly reasonable to do two laps - possible to do 3-5... then receiving 5 aces out of 10-25 dealt is not suspicious at all.
Those Stumpjumpers ran a first-class event with an army of volunteers.
They wouldn't punch mine after 5 draws - they said that we only got five regardless of how many checkpoints we stopped at. I agree it was an awesome event, though. Definitely on my annual list!