How did Elie Wiesel survive?

This has been something that has been asked for many years and for now, has led nowhere.

In fact, the entire allegation of having even been sent to a concentration has never been verified by anyone besides Wiesel.

His name is not found on any of the concentration camp listings (of which the Nazi's were well known for), and even Wiesel's allegation that he is present in the famous Buchenwald liberation photo (a claim he first made in the late 80's) has been contested as being false by Miklos Gruner, who was in fact in the photo and been verified as a inmate of Buchenwald concentration camp.