Prioritize measurable KPIs and terms: transit time windows to key islands, on‑time performance SLAs, inventory accuracy rates, order cycle time, cost‑per‑order and minimum volume commitments. Verify WMS integration, reporting cadence, seasonality capacity, insurance and dispute resolution clauses.

Confirm seaport container/RORO handling capacity, regular ferry schedules, airport freight frequency, dock and yard space, material handling equipment, security and cold chain if needed. Also verify existing integrations with national couriers and visibility tools for tracking and exception management.

Key drivers are local labor rates, facility lease, inbound ocean or air freight (RORO fees), and last‑mile surcharge to nearby islands. Service levels that reduce dwell time and improve order consolidation will lower cost‑to‑serve—track pick‑pack labor per order, inventory turns and fill rates to quantify impact.

Yes—provided the 3PL offers reverse logistics workflows, designated returns processing zones, cross‑dock bays, reconciliation and disposition workflows, and WMS support for lot control and barcode scanning. Confirm SLA for returns turnaround and options for refurbishment or redistribution.