I have purchased a few charm sized Mac pigments but, I am not sure about two of them the others say made in USA , but the Reflects Blue & Reflects Gold say Made in Japan Fabrique AU Japon.
Some of the full sized pigments/glitters are not all made in USA. Having said that I only own one vial and its maroon and made in Canada, but I do know that brushes and other MAC items are genuinely produced in Japan so its quite possible that they were made there. Maybe someone who owns several vials might be able to verify