The Gemara in Shabbat 21b says:
...For when the Greeks entered the Temple, they defiled all the oils therein, and when the Hasmonean dynasty prevailed against and defeated them, they made search and found only one cruse of oil which lay with the seal of the High Priest, but which contained sufficient for one day's lighting only; yet a miracle was wrought therein and they lit [the lamp] therewith for eight days.
Why did the flask of oil that was found have the seal of the Kohen Gadol on it?
Was this his duty to oversee the oil ? (I don't recall such a thing)
If not, was there a particlar story here behind this flask that was found?