Pen fell into defroster vent, how to remove it?

Yep, that is a bummer, there is no other way but to try to listen for the area it fell into and take the ducting and blend door actuators out to try and retrieve the pen, there is no standard repair for this problem. Here are images of the HVAC system so you can see what you are in for when trying to find the pen. Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.