A BA JETSTREAM 31 WAS DISPATCHED WITH AN UNDOCUMENTED MAINT DISCREPANCY.

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ASSIGNED ACFT YYYY; A BAE3101 JETSTREAM. FIRST FLT OF THE DAY FOR THIS ACFT. COMPLETED ACFT ACCEPTANCE CHKLIST PRIOR TO DEP. OBSERVED FO CONDUCTING EXTERIOR INSPECTION OF ACFT. FLT XYX DEPARTED ZZZ AT APPROX XA05 AND ARRIVED IN ABC APPROX XD30. AFTER ENG SHUTDOWN AT GATE IN ABC; I PROCEEDED OUTSIDE THE ACFT TO MANUALLY TURN PROP BLADES PER COMPANY POLICY. WHILE OUTSIDE; I NOTICED ITEMS VISIBLE INSIDE ACFT BAGGAGE POD. THIS SEEMED IRREGULAR SINCE THE STATION RPTED NO ITEMS PLACED INSIDE THE POD AND IT SEEMED TOO SOON FOR STATION PERSONNEL IN ABC TO HAVE PLACED ANY ITEMS IN POD. IT WAS SUSPECTED THAT THE ITEMS IN THE POD WERE ACFT PARTS AND IT WAS FURTHER SUSPECTED THAT THE PARTS WERE PARTS REMOVED FROM THIS ACFT AND NOT RE-INSTALLED DURING OVERNIGHT MAINT IN ZZZ. XYZ'S MAINT CTL WAS NOTIFIED AND THE EXISTENCE OF PARTS IN THE POD WAS NOTED IN THE ACFT LOG. MAINT PERSONNEL WERE DISPATCHED TO ABC; PARTS WERE INSTALLED; LOGBOOK SIGNED OFF. THE NEXT FLT SEGMENT FROM ABC TO XXX DEPARTED LATE.