Oh dear. This guy spent over 10 minutes exploring ways to break into the Chicken Palace. I think I really am going to try and rig up an electric wire. I am a bit scared because it seems like there are a lot of things to decide and figure out - but reviews on BYC make it sound doable.
I think that was really opportunistic (which is why I blame myself), whereas the raccoons are planners. I got several videos over the 10 minutes and s/he was systematically exploring every possible weak spot. Fortunately s/he didn't start digging as there are a couple of places where the skirt is not yet installed. The raccoon went on to overturn every bucket, box and bag I had left outside where I have been trying to clear up the garage.