Original Carpet Color? - 1971 Dart GY8 Gold, Black Vinyl Roof, Harvest Gold Interior (H2Y3)

I'm debating if the carpet is actually original to the car, since it's got 145k miles, and I know it's been out of the car (previous owner put some sort of... metallic insulation under the rear seat) - That's why I'm thinking he swapped it from a different car. I don't think they would have used brown from the factory. :)