Steam ships all hardware orders either from a warehouse in the United States located in Carol Stream, Illinois, or from a warehouse in the European Union located in Waalwijk, the Netherlands.
Who delivers my shipment?
United States and Canada - FedEx.
EU and UK - DHL or GLS, depending on location and availability.
Quoted from Valve Hardware Shipping FAQ :
Where is my package shipped from?
Steam ships all hardware orders either from a warehouse in the United States located in Carol Stream, Illinois, or from a warehouse in the European Union located in Waalwijk, the Netherlands.
Who delivers my shipment?
United States and Canada - FedEx.
EU and UK - DHL or GLS, depending on location and availability.