Right quote from “Former possessor”?

Hello together, actually my topic would have to be in the forum “Car sales” – unfortunately I did not find it. That’s why I try it this way 🙂 The following situation: I bought my smart ForTwo directly from the smart dealer 2 years ago as a demonstration car. Now I want to sell the car again. Question a) Must be specifically pointed out in my ad that it was a pre-car at the time of purchase? Or does it matter in the meantime, since it is a white car? teren owner (i.e. me) gave? and question b) How is the indication “number of previous owners”, e.g. at mobile.de to be interpreted? Is the indication of “2” correct? So the dealer and then me? Or should I not even count myself here, since the car is not sold yet 😉 Hehe, stupid question – but maybe you know what I want to get out of it? Since I want to do everything legally well I am interested in questions of course 🙂