I played that scratch box and Eric did an outstanding job with it. I don't know a lot about scratch boxes but I have seen quite a few from attending this contest for the past several years.
This call had something unique that you can't see from the picture. There are two hidden magnets in box and on the striker which are buried within the laminated wood. They hold the striker in place so you don't lose it.
I've never seen anything like that before but then again I haven't seen everything when it comes to scratch boxes. I just thought that was really cool.