The difference between moving goods internationally and preparing inventory domestically.
Freight forwarders and prep centers solve two different problems, and sellers new to importing sometimes expect one to cover the other.
A freight forwarder moves goods from origin to destination - arranging ocean or air transport, coordinating with a customs broker, and getting the shipment released and delivered domestically. A prep center takes it from there: receiving, inspecting, labeling, packaging, and forwarding inventory to FBA or another fulfillment destination. Freight forwarders generally don't do prep work, and prep centers generally don't handle international transportation or customs clearance.
A seller asks their prep center why a shipment hasn't arrived yet, but the prep center has no visibility into it - the shipment is still with the freight forwarder, working through customs. The prep center's job only starts once the freight forwarder hands the goods off at final delivery. Knowing which party owns which leg avoids sellers chasing the wrong company for a status update.
How delivery method, documentation, and inspection needs differ between domestic and international shipments.
What sellers should prepare, who's responsible, and what causes clearance delays before goods reach a prep center.
How prep needs differ when inventory comes from a local distributor versus overseas manufacturer.
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