What are the values of the 2003 Ford Mustang Centennial Editions

Considering a Centennial Edition cost someone $995 back in 2003 to buy one, it's not worth much more than a normal black 2003 GT at the moment, which is around $8K private party. It was a leather seat upgrade, some badges, a Ford History Book, black watch and keychain. I guess if you had those items, you can get a little more. Place an ad for around $10K and see if you get any takers. Buyers want Cobra's and Bullitt Mustangs, Demand is what sets higher prices.

All true points however, can any consideration be given that 1,300 of the Centennial Edition in a convertible were ever produced. Perhaps there's value in that? Yes, have "The 100 years of Ford Book", keychain, watch and oddly a Centennial BallCap and Centennial Zippo silver lighter (1 of 10,000).