Siamese - Blue Tortie is recessive to Balinese - Cream Lynx
Roxie, Siamese - Blue Tortie bred to Kelwin, Balinese - Cream Lynx.
Their offspring was Rhett a Balinese - Cream Lynx
He bred to Kenza, a Burmilla - Red Silver Shaded, a fur known to be recessive to both test furs.
Their baby was a Siamese - Blue Tortie. Since Kenza can't hide the Siamese - Blue Tortie it has to have been Rhetts hidden fur.
That leaves Australian Mist - Fawn to place and I'm running that test now