ACFT MAINT DISCREPANCY. OPEN ITEM IN LOGBOOK MISSED BY FLC TECHNIQUE PREFLT PROC.

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TRIP ORIGINATED AT MAJOR MAINT BASE; DFW. AFTER ARRIVING AT DEST; CREW DISCOVERED OPEN ITEM IN E6. DISCREPANCY WAS A POSSIBLE MISSING RIVET ON A COWLING. ALL CREW MEMBERS INDIVIDUALLY REVIEWED E6 METICULOUSLY DURING PREFLT. E6 REVIEW INCLUDED AN INTENSIVE DISCUSSION OF HANDLING A PLACARDED ITEM (ENG BLEED). SEVERAL POSSIBILITIES EXIST FOR THE OVERSIGHT; MOST LIKELY BEING THE RIVET DISCREPANCY WAS ADDED TO THE TOP OF A NEW E6 PAGE; WITH THE PREVIOUS PAGE ACTIVE AND THE BOTTOM 3 BOXES BLANK. THIS GAVE THE PERCEPTION THAT THE PREVIOUS PAGE WAS INDEED THE LAST USED. CONTRIBUTING FACTOR WAS THE OUTBOUND CREW MADE NO EFFORT TO BRIEF ME ON THE WRITE-UP AS WE PASSED THEM IN THE JET BRIDGE. AFTER THE EVENT; THE FE SAID A MECH CAME ABOARD JUST PRIOR TO GATE DEP AND INQUIRED ABOUT THE RIVET WRITE-UP. THE FE DID NOT BRING ME; THE CAPT; INTO THE LOOP WITH THIS INQUIRY. INSTEAD; HE TOLD THE MECH NO DISCREPANCY EXISTED AND DISMISSED HIM. THE FLT WAS ABOUT AN HR LATE; FULL BOAT; WITH A LOT OF COMMOTION AND TIME-COMPRESSION DURING THE RUSHED TURN- AROUND. FE WAS ENGAGED IN ACCOMMODATING JUMPSEAT RIDERS. THIS PROBABLY CONTRIBUTED AS A DISTR FACTOR TOWARDS THE OVERSIGHT. DURING POSTFLT; FE COULD NOT LOCATE MISSING RIVET THAT CAUSED THE E6 ENTRY. I ACQUIRED MAINT AND ADVISED MAINT MECH OF THE PROB. SUBSEQUENT INSPECTION BY THE LICENSED MECH ALSO FOUND NO MISSING RIVET. SUSPECT THE E6 ENTRY AROSE FROM A PAX OBSERVATION; UNCONFIRMED BY A CREW MEMBER.