1. Business license shown; name matches the entity you’re contracting with 2. Registry status active on the official system; no abnormal-operations or penalty entries 3. Business scope includes manufacturing (制造/生产/加工), not trading only 4. Export experience confirmed (export record, agent, or forwarder references) 5. ISO / industry certificates issued in the factory’s own legal name 6. Product test reports match your target market’s requirements (CE/FCC/NOM/GS as applicable) 7. Can issue a proper VAT invoice (fapiao) from the same entity 8. Bank account name matches the licensed company name exactly 9. Physical address matches the license and maps to an industrial location 10. Building size plausibly fits the claimed workforce and output 11. Machines observed running (video or visit), count consistent with the product 12. Equipment age and condition consistent with the price tier they sell 13. Raw material storage organized; materials match the spec they quote 14. Semi-finished goods present on the floor (a live factory, not a showroom) 15. Workshop safety basics: fire equipment, exits, PPE in use 16. Dedicated QC area with measuring instruments, calibration stickers visible 17. Staff can explain the production flow end-to-end in specifics 18. In-line quality checks exist at defined points, not only final inspection 19. Defect rate data available and believable (target numbers, not zero) 20. Rework / rejected goods area exists and is actually used 21. Batch traceability: lots identifiable through production and packing 22. Worker skill: operators match the process steps claimed 23. Capacity utilization leaves room for your order in the stated lead time 24. Sample process: they can produce your sealed sample reproducibly 25. Quote is spec-anchored: changing material changes price predictably 26. MOQ explained by process economics, not arbitrary round numbers 27. Tooling/mold ownership terms in writing, in your name or neutral escrow 28. Payment structure milestone-based: deposit + balance after inspection 29. Accepts third-party inspection as a standing term without resistance 30. IP handling: willing to sign NNN; no reselling-your-design evasiveness 31. Asks for payment to a personal bank account 32. Bank details changed mid-conversation (verify by voice before any wire) 33. Price 30%+ below every comparable quote 34. Refuses or endlessly delays a video walkthrough of the workshop 35. Offers branded goods (Nike/Disney/etc.) at impossible prices 36. Registry shows cancelled / seriously-violating status, or company not found 37. New fees appear after deposit: molds, packaging, “export license” 38. Urgency pressure: “price valid today”, “another buyer took your slot” 39. Invoice entity differs from the licensed company without explanation 40. Certificates belong to other companies or fail issuer verification 41. Inspection resisted, postponed, or “goods already moved to port” 42. Any request to move the deal off-platform into private chat before payment