File&Prog deletions

The following objects were deleted suddenly from production library

                                Object Type

                                QRS36E/YREP212 *PF                 

                                QRS36E/YJOP1 *PF                 

                                YRSC/YWUSAR *RPG   

                                as a result of this one of our batch bombed.  
Reported SA,he says 

                                Our Penta reports record deletions, however the 
system audit

                                journal receivers are cleaned up automatically 
and we retain

                                only the last 10 at any given time We hit a gap 
here where

                                the report did not pick up the deletion of 
these objects, because 

                                the journal had been purged for that time 
period.

                                 

                                Is there any other way we can find out who 
deleted it ?how they got deleted?any better practises?

                                Thanks for taking your time, appreciate your 
help!

                                Murali.