Right. LCROSS examined parts of the moon that had never been fully explored before, and certainly different areas than the cursory & superficial exploration made by the Astronauts. Simply put, the Astronauts had no way to examine anything much below a few inches to a foot of ancient lunar "dust", nor did they have any ability to look deeply into these craters on the dark side of the Moon, where some of this water is now known to exist in frozen state.
It's much like standing on top of a Blue Ridge mountain peak in the 10th century BC, and not seeing any coal, although clearly we now know centuries later coal is incredibly abundant in that region. The same could be said about the aquifers located beneath Death Valley. Standing in Death Valley, one would be hard pressed to find much water. But it's there - plenty of it. You just need to know where to look.
Ok thanks for the information. It is much appreciated.