Which of the following is not a third conditional?

I couldn’t have seen the cave paintings if I hadn’t taken a guided tour.

I might not have gone to see the cave paintings if I hadn’t read about them in the guidebook.

If you had a car, you would have more freedom.

If I had found a cave painting, I would have been very excited.

If early humans hadn’t painted in caves, the paintings would have been washed away.