No, it's not possible to get a fake brush from a CCO. All brushes have minor differences due to the fact that they are handmade. The France inscription on my 266 brush is pretty deep and I bought it from a counter.
Oh, thank you. I was frightened that my 136 was a fake. I can tell you that I bought a foundation brush from there and it was painted like the MA does at the counter to identify that it belongs to them. It was in the sleeve and appeared new.