Focus on pick-and-pack cost per SKU, average order cycle time, on-time shipment rate, inventory accuracy, and chargeback policies. Also verify WMS integration (API/EDI), SLA language for seasonal peaks, and how they handle returns and kitting to understand true landed fulfillment cost.

Closer proximity shortens dray and inbound lead times, increases carrier choices (parcel, LTL, regional TL), and enables mixed-modal routing. That reduces transit variability and can lower freight spend by enabling consolidation and better LTL tendering across carriers.

Confirm available SKU storage density, dedicated returns processing stations, value‑added services (kitting, labeling), temporary overflow capacity, labor scalability, and real‑time reporting. Ask for historical performance during peak season and documented contingency plans.

Negotiate clear rate cards for storage, receiving, picks, and value‑added services; min/avg monthly volume commitments; SLA penalties; and data access. Ensure WMS APIs or EDI, scheduled reporting cadence, and carrier tendering options are contractually guaranteed to preserve visibility and control.