Hardly.
VK posted a video of one of the cap stones in a museum. They aren't all missing. The stone has engravings that tell a story that 'they' don't want publicly known.
Ken Wheeler did a video about it some years back.
In response Water Mark to his Publication
Whoa! Really???? i thought they were swept away in The Flood. You got a website or a picture? cool
In response Yankee Carolyn to her Publication
I may be incorrect that this is a capstone, YC. It may only be a small, stand alone sculpture. Ken's interpretation is worth watching regardless.
https://www.youtube.com/watch?v=SP0kCO7_YmE