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my first thought was ooh, that'd be good for mixing paint.
Next are "show them to traditional craftspeople and ask what they'd use them for or how they'd make them" and "period tracker or promise of days until next meeting".

https://nebula.tv/videos/stefanmilo-europes-undeciphered-prehistoric-tablets-enigmatic-artefacts/
https://www.youtube.com/watch?v=oYWUXQKUMuc

ohhhhh with the snapping, it's like a promissory note or early parentage ID for example.
Count down to wedding, if prehistoric peoples even did marriage?
Good point about "probably not just one purpose" tbh.