Let me clairfy it then ..... NASA claims that hundreds of pounds of moon rocks are in their possesion ... but they also claim that only a few pounds of those rocks were picked up by the Apollo astronauts .... So that leaves the other "hundreds of pounds"of rocks being picked up by unmanned robotic missions because there was no room on board any of the LM's to carry back hundreds of pounds of heavy moon rocks ....
Unfortunately, they do not claim any such thing. What they document is that Apollo crews collected a bit over 800 pounds of lunar samples. All of it collected by the 6 crews whose job it was to do so.
There was plenty of room to carry the samples back in the LM. We designed them to house the SRCs that would be required to hold the material.
The "anamoly" is in your lack of understanding what you're looking at. Did you happen to notice that Charlie (Duke) had to get in a very awkward position to get that rock off the ground (Which takes some effort in a suit with 183 pounds of mass). Did you notice that because he couldn't easily get down on the ground that he had to roll this thing up his leg in order to get a hold on it? Do you understand anything about what it is to operate in 1/6 g, and the difference between mass and weight?
We would not assume. We would know that the LM was designed to carry the samples we collected. We would, were we to investigate the matter, know that each LM actually did carry a specific amount of lunar samples back with them.
You may "believe" that unmanned spacecraft recovered hundreds of pounds of lunar material, but knowledge would show you that we've never had any unmanned craft that had such capacity. You may also "believe" that the rocks were recovered in Antarctica, but knowledge would show you that Antarctica, despite having a small amount of lunar meteorites, has nothing resembling the lunar material collected by Apollo crews.
In fact, knowledge would show you that it is impossible for the material from Antarctica, as miniscule as it has been, to be anything like the lunar samples returned from Apollo missions.
The Apollo lunar samples are singular, and unlike anything else on the Earth. They are indeed from the Moon. This has been previously established.
Now, what "proof" do you have that NASA claims that only "a few" pounds of lunar material were actually collected by Apollo astronauts?
What "proof" do you have the the LM could not have held the SRCs that were designed to be carried in it?