Oh moth brown was in another collection. If it doesnt have the barbie imprint on it or anything, and has the black writing on the lid, its probably an authentic one as well, just from an older collection
The Barbie eyeshadows that was first launched had MAC in white on the lid. The eyeshadows were sold out and then were available again later on for purchase online and at the counters. However, the eyeshadows this time had the word MAC in black and didn't have the Barbie logo on the box.
Just to confirm, I bought a Don't Be Shy blush from a MAC counter, and it was from the 2nd shipment. It came in normal packaging, with black MAC logo on the window.