If you have any doubts about the car or its title, go elsewhere. Using the flashlight, peer through the wheels into the brake calipers. Try to determine how much pad is left. It is sometimes difficult to see just how thick the pads are. It helps to move the car a little to see around the spokes.
Replacements can be expensive.
The little round plastic thingies come out easily if you use a fingernail to lift the center piece first and then pull out the whole fastener. Look behind this panel for evidence of bodywork, bent panels, etc. The outer skin just above this area is unprotected from junk in the trunk and you can get dents from the inside. Many Miatas have an aftermarket panel bolted in here to protect from this. Check here for signs of repair.