How to open air filter box?

I want to install a K&N air filter in my 03 4-cyl Camry soon. However, this Camry is the first one I've seen that has two strange-looking bolts holding the air filter box shut. They have a pattern I've never seen before. They kind of look like a star only four-sided, not five. Anyone have any ideas? Thanks in advance. :smile:

I solved the mystery. The bolts are simply hex-head and took only a 10mm socket wrench to remove them. Installing the K&N air filter was a piece of cake. The filter cost $35.52. Kragen Auto Parts wanted $50.95. :nono: