al hacer el pedido dice que "puede estar sujeto a coste de aduana" sin especificar en ningún momento si es así, y en caso afirmativo, cuánto habría que pagar según el país donde se recibe (España 15€)

Thank you for contacting us.
Regarding customs duties, since these are handled by the government, we do not have detailed information about them.
Therefore, we have only stated that customs duties may apply.
Thank you for your understanding.

très bien emballé et correspond au descriptif. Excellent état. Merci

Thank you for your purchase.

This is a very rare item even in Japan, so I hope you will cherish it.

Il pacchetto era interessante ma sono stato un po’ sorpreso quando  ho dovuto pagare 27 Euro extra for Customs purposes. 

Please refer to the Important Information for details regarding customs duties.