There are several aspects worth noting. First is 'country of origin determination standards.' US Customs has strict requirements for 'Made in USA' certification or eligibility for preferential tariff treatment, requiring substantial transformation or a certain percentage of domestic processing. Simply completing packaging or testing in a third country does not necessarily change the country of origin. Second is 'completeness of supply chain documentation.' Buyers and audit units increasingly require traceability documents back to the manufacturing stage. Providing only final shipment location data is no longer sufficient; you need to demonstrate the complete source of each manufacturing step. Third is 'continuous monitoring of policy dynamics.' While the 55/45 policy is still in the discussion phase, subsidies eligibility, tariff surcharges, export controls, and related measures are being adjusted progressively. It is recommended to regularly confirm the latest applicable scope to avoid affecting quotation and delivery commitment due to regulatory changes.