A commenter on GH's post brought up this link regarding Tfillin. The pictures though, show what appears to be round tfillin. I have never seen that before.
Also, if you notice in the first drawing, you will see the arm tfillin box is much smaller than what we are normally accustomed to. The only time I have ever seen one of this size, are the tfillin that were found in the Qumran caves. This link gives you the dimensions, but I recall seeing a photo of one box that was about the size of a dime.