My vote is coastal mutt. Like El-Ziggy said, unless you find the breeder, you are more or less going to have go by what the seller says if you believe him or just call him a 'mutt'. And there is nothing wrong with mutts. One of my favorites is my 7' normal bci girl who I got as an 18" danger noodle from my local mom and pop shop. She is now 7' and the sweetest snake. Everyone loves Rosey when they meet her
Just be happy your carpet isn't high strung. Allison my JCP can go from sweetie to terror in about 0.0003 secs haha.