I just got the TP9 EC in FDE. Everything I've read, including the owners manual that came with it says it comes with 4 optic mounting plates. I only got one with mine. Did they change something or did I get shorted?

A while back they went to just one mounting plate. Probably to cut costs. If you know what plate you need, you can order one I believe. If you need a #2 plate for Trijicon/Holosun, you might have to order one form Coventry Industries.