While walking the Via Francigena Sud last fall my wife and I heard of the Italian olive growers in the Puglia region using GPS olives. From the article below I see that it is also being used in Spain.
https://www.saveur.com/tracking-devices-disguised-as-olives/
This site is run by Ivar at in Santiago de Compostela.
This site participates in the Amazon Affiliate program, designed to provide a means for Ivar to earn fees by linking to Amazon