It sounds to me like maybe the seller was inexperienced and figured that a buyer would be more interested in a coin that looked closer in color to how they looked when they were issued. If I recall correctly they were a coppery color when freshly minted without the green patina.
I feel absolutely defective not having a coin from this die but I do love the way every reverse went far beyond the call of duty to insure every letter appeared somewhere on the coin even though most had to get creative to make it happen.