Ian is correct in saying that the Cert.s and x-section should be forwarded to QA. It would be the responsibility of Incoming or Receiving Inspection to validate the materials. Your suppliers are offering proof that they comply to industry standards or purchase specifications. Someone in your company should be checking the suppliers proof, failure to do so introduces the potential for faulty product being used. If you don't have anyone doing this or your QA department is unaware of what to do, you need to get educated. Get IPC/EIA/JEDEC spec.s for PCB's. Your supplier may be helpful in interpreting spec.'s but don't just take their word for it. Check your purchase agreements for any spec.'s stated and also your gerber files. Your design engineers may have imbeded spec.'s on the top and bottom layer drawings for the fab.'s.
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