These supposed kg's are safely kept by someone who does not give away anything.
Of course they don't just give them away. They came from the Moon and we don't have any more coming in any time soon to replace them. Therefore you have to justify your requirement to use them for your research. That is standard practice.
If you would want to investigate you have to fill in lots of forms, and then, if they like you, you get some mg of moonrock.
You can get grams of rock or soil.
That could be real moonrock, or some prepared rocks like meteorite parts.
Ah, the usual 'geologists wouldn't know a real rock from a fake one' garbage. Do feel free to dismiss an entire branch of science in one fell swoop...
There are no big discoveries done by anyone with the moonrocks. Every claim about that reverses to that same person who holds the supposed moonrocks from Apollo.
Evidence for that claim please?