If they sold it to you as a "special" pastel, then maybe they meant the gene called special + pastel?
Here are a few examples of a special pastel, they can be pretty variable.
https://www.morphmarket.com/us/c/rep...pythons/239690

https://www.morphmarket.com/us/c/rep...-pythons/19397

https://www.morphmarket.com/us/c/rep...-pythons/26074

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