I can speak to you from experience since on more than one occasion we have suffered losses due to the confiscation of packages coming from China to the European Union and the wisest advice I can offer is not to fill out any forms, not to answer any of the messages from customs or try to save the package, stay out of it at all times and from this moment on take the basic security that you should have. (change of phone number, emails, etc.). Surely your package will be destroyed later and depending on its content the authorities will be satisfied with its destruction or an investigation will be opened if it involves quantities of notorious importance in class 1, if it is about reagents or research chemicals that have not yet fallen under You shouldn't have to worry so much about the law and it would be enough to make a few changes in your life. Blessings and encouragement!!