TF2 / CS / Dota 2 Keys untradable for 1 week

"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."

http://steamcommunity.com/market/listings/440/Mann%20Co.%20Supply%20Crate%20Key

.... no comments valve, just 3 days before winter sale they screw up