Skins from The Ancient Collection are not obtainable through the weekly drop.
The Ancient Collection is a Valve-made collection of CS:GO skins introduced on 03 December 2020. The collection consists of 5 consumer skins, 4 industrial skins, 4 mil-spec skins, 3 restricted skins, 2 classified skins, and 1 covert skins.
This collection is exclusive to players who have activated an Operation Broken Fang Premium Pass. A random skin from this collection can be purchased from the Operation Broken Fang store within the CS:GO game client for 4 stars.
The Ancient Collection was rumoured to return in a Souvenir Package for the PGL Stockholm 2021 Major after the addition of Ancient to the Active Duty Map pool. This rumour was proven true with the introduction of the Stockholm 2021 Ancient Souvenir Package.