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This crate only holds a Righteous Bison Strangifier, which is 1 key. So if you want a righteous bison strangifier, this crates has it
Masked Mender - Mercenary Grade - (Factory New)
It said on backpack.tf that it is 3.86 keys, so I'm bringing it down to just three
Brick House - Mercenary Grade - (Minimal Wear)
The price on BackPack.tf is 0.88 ref, so here is the offer