What can you tell me about the pastel yb Mirage?

I was speaking to a guy in Indiana who is interested in trading me some ball pythons for a couple boas I have for sale. One of the balls he has is a 1.0 Pastel YB Mirage about 935 grams. I've never heard of a Mirage before so I tried researching it the best I can. I found a few of them on Morphmarket through a google search because the Mirage is not listed in the genes/traits, nor does it work in the calculator, which seems strange to me. Can anyone offer some input about the Mirage? Thanks in advance!