Tip: Register Items Before You Leave The United States If your laptop computer was made in Japan—for instance—you might have to pay duty on it each time you brought it back into the United States, unless you could prove that you owned it before you left on your trip. Documents that fully describe the item—such as sales receipts, insurance policies, or jeweler's appraisals—are acceptable forms of proof. To make things easier, you can register certain items with CBP before you depart— including watches, cameras, laptop computers, firearms, and CD players—as long as they have serial numbers or other unique, permanent markings. Take the items to the nearest CBP office and request a Certificate of Registration (CBP Form 4457).
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CBP Form 4457 ) It shows that you had the items with you before leaving the United States and all items listed on it will be allowed duty-free entry. CBP officers must see the item you are registering in order to certify the certificate of registration. You can also register items with CBP at the international airport from which you’re departing. Keep the certificate for future trips.