Sierra Madre Souvenir Aficionado

Sierra Souvenir Aficionado is an achievement/trophy and challenge in the Fallout: New Vegas add-on Dead Money.

Requirements

 * Collect 500 Sierra Madre chips

Locations
Sierra Madre chips can be found mainly in the villa in fountains, inside of buildings they can be found in dressers, night stands and on tables. Just be sure to check everywhere, including places you haven't visited or inside the casino itself.

Alternatively, collecting the Sierra Madre snowglobe will award 2000 chips and complete this challenge, as the chips it gives quadruple the amount needed anyway.