More chips from today’s Craigslist purchase. They appear to be ivory, with striating but no markings. Can anyone confirm their origin or tell me what else they might be? They sort of have a waxy feel and they go “thuk” when riffled/stacked, as opposed to the clink or even clink of clay chips.

The last picture shows the only pattern I could discern (most either never had a pattern or are VERY used). Looks a bit like an acorn or a rose bud.