Under international postal agreements the sender must complete a customs declaration (form CN22 or CN23) which in most cases should be fixed to the package. The declaration includes a description of the goods, the value and whether they are gifts or commercial items. Any Post Office abroad should be able to give advice to the sender.
You are legally responsible for the information on the declaration; therefore it is in your own interest to ensure, wherever possible, that the sender abroad makes a complete and accurate declaration. If no declaration is made, or the information is inaccurate, the package may be delayed while we make further enquiries, or in some cases the package and its contents may be seized.