I guess it depends on how you view those situations. In terms of the actual person its happening to, if there was nothing there at all, they would experience nothing, meaning either they would not remember it all(as in deep sleep) or reality would be nothing in that there is nothing for them to experience.
In the first case you listed it doesn't seem to me to be "no mind" but unconsciousness. This would be like deep sleep where nothing is remembered. So say you were born human, then born into a state of unconsciousness, then human again and you could remember your past lives, it would seem to you that you were human, then died, then were born human again. There would be no remembrance of that state, so as far you are concerned it wasn't real.
In the second case, if one doesn't experience the body then it isn't real. If you were in such a state and were burned, cut, etc.. You wouldn't experience pain, therefore it wouldn't be real to you. This would be seeing not self, impermanence and suffering. If you can enter into a state where there is no connection to the body, then obviously it is not "you". The fact that this change from being aware of the body to being unaware shows impermanence. And you see dissatisfaction because of these changes.
From my point of view, we can only verify what we experience to be reality. In the same way one who is happy, upon seeing a rose will find it beautiful, while one who is angry will only see the thorns. One's reality is beautiful the others is ugly and hurtful. I find this to be the reason to practice Metta and cultivate good thoughts, it impacts your reality. Without practicing Metta, when someone wrongs you, you only see it as them striking out at you. With a Metta filled mind you understand they are the same as you and act out of ignorance just like all unenlightened beings.
In Vipassana you note what you experience. You don't think, "It someone brought me a piece of pie right now I would be so happy!!". Well, you may think that
but you just note it, you don't purposefully cultivate "what ifs".
Edit: Just to clarify this is just how I see these things from my own experience in practice, I'm not playing the Devil's Advocate or something like that.