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asiointi.tulli.fi › asiointipalvelu › ext-authSep 23, 2022 · Enter the arrival ID of a postal consignment. When declaring a postal consignment, you should provide the arrival ID, that is, the item tracking ID provided in Posti’s notice of arrival. By doing so, some of the declaration details will be filled in automatically. The same will happen if some other transport company has agreed with Customs to ...