Canadian shipments and shipments destined for the U.S. do not need an attached customs form. Shipments to any other country however, must be accompanied by a CN-22 customs form.
Note: When purchasing international postage from Chit Chats, the CN-22 is automatically generated and included within the shipping label. However should need, you can download a sheet of CN-22 forms as a PDF to print off or ask for one in-branch.