TF2 Mann Co. Supply Crate Key (Small) (7XSQ5Z3XA) by iKonakona
Mann Co Supply Crate Key - Team Fortress 2 (TF2) - a01902940593630 | OpenSea
TF2] Mann Co. Catalog has multiple duplicate entires for "Mann Co. Supply Crate Key" in place of keys that used to be sold to open older event crates · Issue #4154 ·
Yes, there is a black market in Team Fortress 2. Here's an explanation « Icrontic