You can still retain a hint of a surprise by being general and not specific on the customs forms.
Write 'small gift' or 'ornament', for instance, instead of 'cat figurine', or something.
The present I received is safely stashed away. The sender's name is S.Hogfather, so I've no idea what customs made of that!
Going to my school was an education in itself. Which is not to be confused with actually getting an education (Schultz)