I'd say the one on the left is from Texas. If it flaked easily, it was probably heated. That stuff can be a bear to pressure flake when it is raw. I have some English flint that looks exactly like the center one, it is pretty tough too. I have no experience with working chert from Belize, though I saw similar colored flakes as the point to the right when I was at some Mayan ruins in Belize a few years ago. Hope this helps.
Jim