Diamondback Terrapins

I am wondering if paddlers or others plying brackish waters of the Lower Suwannee and Cedar Keys National Wildlife Refuges have spotted these small (7-9 inches as adults) turtles. Although conditions seem perfect and they should be plentiful, in my limited experiences as a paddler, I have never seen one. Nor have I heard mention of them. The FWS photo above is an animal from Maryland. Individuals in our region would be expected to be more colorful.