It took some time to figure out how he achieved his escape. The video tells the story.
With Oliver escaping whenever he wants to, he's been getting in more fights. Oddly, I haven't heard the fights, but he's covered in cuts, scratches, and scabs. With the SureFlap Pet Door rendered useless, now I need to come up with another plan! Mouses!!
That Oliver is one clever cat! Since he's perfected his technique, he's gone on to teach Pierre and MK how to open it. So now all of them can come and go as they please. I plan to ask the manufacturer for recommendations on tips to keep clever cats from using their claws to open the door. I hope they have an answer! Oliver!!