Acabo de ver que han puesto esto en steam en las llaves de TF2
"Note: Starting in the next few days, items purchased for Team Fortress 2 either in-game or on the Steam Community Market will not be tradable or marketable for one week after purchase. We are making this change to combat fraud and scams, and to help matain a safe and healthy item economy within Team Fortress 2."
Osea que próximamente si compras la llave en steam no se podrá tradear ni vender en el market hasta la semana siguiente a su compra.