How to tell if a Customs Seal is still valid Home › Forums › Shipping and Freight Questions and Answers › How to tell if a Customs Seal is still valid This topic contains 1 reply, has 2 voices, and was last updated by Hariesh Manaadiar 4 months, 3 weeks ago. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts 23 February, 2018 at 20:08 #94049 mmcgirl1Participant I’m looking for a resource to look up Customs Seals on the outside of two shipping containers to see if they are still valid. Where would I go to do that? Google has already let me down. 28 February, 2018 at 21:25 #94060 Hariesh ManaadiarKeymaster Hi, sorry, your question is unclear.. When you say resource to look up Customs Seals..?? Do you mean you want to check if the customs seals have been tampered with..?? I have not heard of customs seals having a validity.. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic.