I see. Even I don't know how to verify an auction sheet. I know members here who can. Beware as a fake sheet can also be there. It's best if you don't buy the car tomorrow, just visit them and ask for auction sheet along with papers. Post it here. If verified buy it the next day, if that doesn't present a problem.
As for my friend's vitz. Mechanically and physically it seems to be pristine. I have driven it too. No issues at all. Still the missing auction sheet seems fishy to me.
Feel free to ask anything brother.