Skins from The Chop Shop Collection are not obtainable through the weekly drop.
The Chop Shop Collection is a Valve-made collection of CS:GO skins introduced on 26 May 2015. The collection consists of 4 consumer skins, 3 industrial skins, 5 mil-spec skins, 2 restricted skins, 2 classified skins, and 0 covert skins.
The Chop Shop Collection was available as a weekly drop to players who held an operation pass for CS:GO operations Bloodhound in 2015, Wildfire in 2016 and made its final appearance in 2017 for Operation Hydra.
The M4A1-S Hot Rod is arguably the most desirable skin from the Chop Shop collection with players using the Dual Berettas Duelist and SG 553 Bulldozer in high risk trade up contracts.