The first three are mostly unknowable, for now. Trying to do useful research in this arena has become fairly daunting, the signal to noise ratio is lower than ever. I gave up, I had other research to do. 4. They probably only started destroying evidence right around the time Trump (or someone he takes advice from, if such a person exists) gauged that not everyone in the world was writing off his early campaign days as an utter failure. Trump's problem is that it takes more than a year or two's worth of furious evidence erasure to whitewash a billionaire-level family empire's paper trail. He's in some shit, dude, even though he's bought leagues of people to assist with the effort, I'm sure. We'll probably hear from them after the gag orders get lifted. Yeah, they'll start by looking into Russia, but god knows what else they'll find.