Original story I saw, this DW one has better pics.
https://www.dailysabah.com/life/history/archaeologists-unveil-worlds-oldest-jewelry-in-morocco
Anybody that's done any beach combing has seen thousands of similar small shells worn away by by tidal action against harder shells or rocks. And found in a cave near the coast. Mystery? Maybe not.
Need a macro photo of the presumed man made perforations.