Consignment declaration

Hello, for the first time I sent a purchase from third parties over €150. I received a message from post.lt that the shipment needs to be declared. I filled in everything, attached the invoice, bank transfers and confirmed it. It’s already 9 days and I haven’t heard any news from post.lt or customs 🤷 Anyway, I saw that it takes up to 5-10 days, so I started looking to see if I missed anything. And when I went to the spam section of the mail, I saw such a letter with the subject title do not reply. As far as I understand, I still need to fill out some kind of standard declaration? If so, where? 😅