You must present originals of every certificate listed in the notification at the SSC GD document verification.
If an original is missing, the board may give you a short window to produce it — but this is not guaranteed.
Without the required documents, your candidature can be cancelled even after clearing PET/PST and the medical.
Apply for re-issued certificates from the issuing authority well before the DV date.
Carry attested photocopies too, but photocopies alone are never accepted in place of originals.