Knives in the case
The Exceedingly Rare Special Item group lists the Bowie Knife, Butterfly Knife, Falchion Knife, Huntsman Knife and Shadow Daggers in the six Gamma finishes: Gamma Doppler (in several phases), Lore, Autotronic, Black Laminate, Freehand and Bright Water. There are no plain knives here.
Collection and related cases
The weapon skins belong to The Dreams & Nightmares Collection, and every one of them also has a StatTrak™ version. The Operation Riptide Case lists exactly the same knives and finishes.