Prior to US Departure Customs Form May Ease International Travel If you would like to prove ownership of personal items, such as laptops and cameras, in advance of international travel, you will need to obtain and fill out a "Certificate of Registration" (CBP Form 4457). Click here to download form or obtain one at the official customs location at your point of departure (at Logan Airport, this office is in Terminal E and can be reached by phone at 617-568-1810). It is essential that you bring both the completed form and the items you wish to clear to the official customs location prior to departure. This certificate provides proof of article ownership and therefore may secure the article exempt of customs duties on U.S. reentry upon approval from your customs office. For additional information, or to locate official customs offices other than that at Boston Logan, visit the US Customs website: http://www.cbp.gov/xp/cgov/travel/clearing_goods/.