A trace asks where the shipment is and whether delivery can still be completed. A claim asks for a remedy under the shipping contract after loss or damage is established. Open the FedEx delayed-or-lost support path with the scan chronology first when location is uncertain, while preserving the invoice and shipment records needed if the case becomes a claim.
For a retail order, give the merchant the tracking number, last physical scan, promised date and FedEx case reference. Ask whether the merchant will replace/refund under the sales terms and file the carrier claim as shipper. Do not let parallel claims create inconsistent descriptions or values.