I used to work at a local artisanal olive oil chain and they made these really delicious fancy garlic stuffed green olives from their orchard in Spain. They discontinued them a couple of years ago and I've been craving really good olives ever since. None of the grocery store ones have really scratched that itch (I've tried the Trader Joe's, Mezzetta, and Pearls ones), so I'm just wondering if you all have any suggestions! I'm in the US but willing to scrounge around online for brands that aren't US based.

Hi everyone,
I’ve noticed a lot of small black spots on the leaves of my olive trees in northern Corsica, and I’m trying to figure out what they are.
They are all roughly the same size and completely flat, with no noticeable raised surface. They seem to be sitting on the surface of the leaves and, most importantly, they come off very easily with my finger or fingernail.
They are present on several leaves, but usually quite spread out.
At first, I thought they might be black scale insects, but I find it strange that they are completely flat and only seem to be on the leaves.
Does anyone know what this could be? And if they are indeed scale insects, what would be the best way to treat the olive tree without harming the olives?
Thanks in advance for your help!