[S3E3] Why don't the cameras pick up Coop in the glass box?

Hey gang. I'm sure this must have been asked and answered several times but I can't find it, please bear with me.

When Preston gets the video footage from the glass box, why isn't there a sighting of Flying Coop in amongst it? The kid doesn't stop the recording of all cameras when he steps outside does he?

It's been bugging me for weeks but seems so obvious that I'm sure I must have missed an explanation.