IHIT is asking for public help, so that likely has something to do with running the picture. Maybe they did manage to procure other ones, but were too low quality to be of any use? I’m giving the local press the benefit of the doubt; IHIT are trying to solve this case & need leads. I don’t believe the articles have…

There’s a long-existing Facebook page with this concept: https://www.facebook.com/Meanwhile-in-C…

The "honeycomb" corrugated cardboard is standard for residential hollow core doors.