Not really. They have survived very large scale US-Saudi bombing campaigns in the past and managed to maintain deterrence against Saudi infrastructure throughout, so unless the US invades in foot there will be no more finding out. And of course, if the US does, it will likely also do a significant amount of "finding out".
You place too much trust in U.S. troops. They invaded Afghanistan, spent twenty years and trillions of dollars, and left it like they were never there. It's like an expensive vacation where they forgot the souvenirs!
