According to the official CBP website, the CBP 4455 form should be used “When exporting goods purchased overseas for repair, alteration, processing, replacement, exchange, upgrade, or for use abroad, it is recommended that the exporter fill out a CBP 4455 Certificate of Registration and include a copy with the shipment.” Fortunately, there is no deadlines associated with the form, it just must be filled out and given to a Customs and Border Protection agent or, if the item is being mailed, it must be placed inside the package in an easily accessible spot. If the item in question is under warranty, the overseas supplier much indicate in on an invoice and then also include the invoice in the package. If the item is being exchanged, upgraded, or replaced and the value of the goods is more than the original purchase, the invoice must also indicate the price difference between the original item and the new item.
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