My Carbon says 1.5g as well, and I bought mine at a MAC store. It looks real enough to me, but my only concern is that I do not see a batch code on the back of the shadow packaging. It should have an imprint somewhere on the label that gives a letter and two numbers or two letters and a number. It could just be a bad picture (since a batch code is a little hard to see in real life) though. The packaging, fonts and their sizes all look correct to me though.