Not much to report so far, unfortunately. I don’t see any public science report of an analysis of the returned sample.
The sample capsure returned to Earth at Woomera in Dec 2020.
The main spacecraft Hayabusa2 continued on an extended mission.
“the size of the particles is estimated to be typically several centimeters, ranging from ∼1 mm to several decimeters”
“Jul 09, 2021 The first sample of asteroid Ryugu has recently arrived at the Johnson Space Center, National Aeronautics and Space Administration (NASA). The sample is the first one to which has been sent to NASA for further investigation, according to a NASA blog. These samples were gathered by Hayabusa2, the spacecraft created by the Japan Aerospace Exploration Agency JAXA. … The scientists analysing asteroid Ryugu include Mike Zolensky at the Scanning Electron Microscopy Lab. Before NASA received the samples, Hokkaido University was the first to study the Ryugu samples.”
“boulders on the asteroids have 70 percent empty space.”
“Asteroid Ryugu samples were limited. The collected fragments were only about 100 milligrams or less in total.”
:-(
“Ryugu, with a primitive C-type classification, is dubbed as a fossil of the solar system, as it is believed to contain remnants of organic matter and even water that dates back 4.6 billion years ago, contemporaneous with the origin of our solar system.”