That said, there is a lot of security involved in getting hold of those samples

I guess this holds true for the samples that can be manipulated and not so much for the "publicity" (my term) samples. When I was in high school (oh so many years ago) My chemistry/physics teacher had obtained a plexiglass or glass plate in which were embedded several samples of lunar material. We couldn't do anything more than examine the samples under a microscope, but even that was enough to compare to similar Earth formed samples and demonstrate that the lunar samples formed in the absence of water.
There was no guards needed and all Fr. Stout had to do to get it was write to NASA for them on loan as part of a program to make limited lunar sample material temporarily available to schools.

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