. . . I had wondered about those finer holes, too, if they were not for suspension purposes. . . Could any of them be arranged to be used as a flute or something similar as M Seabrook suggested? Especially, the ones with multiple holes to produce resonance tonal frequencies according to some ancient theme that might have been contemporary then? . .
If any of them were suspended somehow there might be physical signs on the material that could show up under a microscope to suggest abrasion from frictional causes. . .
I haven’t found the photos I saw yet that showed what looked like dirty spheres of very unusual material from what seemed like an ancient volcanic event. They were preliminary photos of a very large outdoor sight in Siberia taken by Russian Archæologists from field explorations the Russian team was working a few years back which had these odd looking spheres strewn around as if flash frozen. When in China did you see anything like dirty spheres which might have been reused or retooled into something in your recent photos by chance?
Some of those spheres seemed similar to those in Costa Rica and Bosnia only less refined.