If the stones where not vacuum sealed right away, but
only put into a box during the mission,
any gas / vapor components are inconclusive.

Here a picture of the sameple box
http://history.nasa.gov/alsj/tools/tools48.jpg




also, if moon would have 1 liter water per 1 cubicmeter of soil
that woul be 0,1% of the soil beeing water.
And thats too much to be belivable...