AN EMB170 FLT CREW ON A FLT TO ZZZZ DISCOVERED ON ARR THAT 16 50-LB BAGS OF BALLAST HAD BEEN LOADED IN IAD AND WAS NOT ON THE WT MANIFEST WHEN THEY DEPARTED.

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FLT WAS CONDUCTED WITHOUT INCIDENT; AND OUR WT AND BAL ISSUE WAS NOT DISCOVERED UNTIL AFTER THE FLT WAS COMPLETE. WHEN WE RECEIVED THE LOAD RPT FOR OUR NEXT FLT IT INDICATED A '16X50' IN THE HVY BAG SECTION FOR THE FORWARD CARGO COMPARTMENT. I DID NOT UNDERSTAND; SO I ASKED THE RAMP AGENT TO EXPLAIN. HE TOLD ME IT WAS 16 BAGS; 50 LBS EACH; OF BALLAST THAT WAS ON THE ACFT WHEN WE ARRIVED. NONE OF THIS BALLAST HAD BEEN RPTED BY THE PREVIOUS STATION ON THE LOAD RPT PRIOR TO FLT. I HAD SEVERAL ISSUES WITH THIS UNRPTED MATERIAL IN THE CARGO COMPARTMENT. FIRST ISSUE; SECURITY; WHAT IS THIS STUFF; WHO PUT IT THERE AND WHY WAS IT NOT RPTED TO ME. SECOND; WT AND BAL; I JUST FLEW A FLT WITH 800 LS IN THE CARGO COMPARTMENT THAT WAS NOT ACCOUNTED FOR IN THE WT AND BAL CALCULATIONS. THIRD; CUSTOMS; WOULD CUSTOMS HAVE AN ISSUE WITH THIS UNRPTED MATERIAL IN THE CARGO COMPARTMENT. ACTION TAKEN: I CALLED CUSTOMS WHO SENT AN OFFICER TO INSPECT THE MATERIAL. HE LOOKED AT IT; TOLD ME IT LOOKED LIKE STANDARD BALLAST; AND THAT I COULD TAKE IT BACK WITH ME. I DECIDED HOWEVER THAT I DID NOT WANT THE BAGS ON MY ACFT; HAD THEM REMOVED; AND TURNED THEM OVER TO CUSTOMS FOR FURTHER INSPECTION. OUR NEXT FLT CONTINUED WITHOUT INCIDENT.