Forgery In Trial Court Records, Sealed Envelope Changed

This is a case of forgery, tampering of judicial records wherein some reports under sealed envelope were changed in trial court records. Has been done in collusion of court staff. Applied for inspection of reports so as to verify the actual signatures, and also forensic examination of the reports. Court denied. Isn't that strange? Court asks for law/ rules/ judgements that evidence that sealed cover reports must be shown. Ironically some extracts of that report relied upon in judgment but court not allowing inspection of actual report. Suggest legal remedy. Which rules of inspection permit inspection of sealed cover papers? Any judgments to that effect?