I donated thousands of specimens that I collected from anthills on my sons’ M&M Ranch (mostly Oligocene but there are a few Eocene small areas) in Nebraska to the Smithsonian and to the South Dakota School of Mines and Technology Museum of Geology. There are currently six researchers studying the specimens with multiple papers in progress. Covid-19 slowed the progress down significantly but it looks like a few of the papers are now starting to move forward.
Below is a link to one of my TFF posts that shows a few of the micro specimens that I collected and donated: