Air carrier Captain reported the Final Dangerous Goods report contained multiple errors. With no simple solution available; the Captain had the Dangerous Goods shipment unloaded prior to departure.

Narrative

When the final dangerous good (DG) report was received I noticed that there were two items listed; but one did not have a pieces (PCS) count and a weight listed as '.0 LBS.' Finding that odd; I began to inquire about this particular item; especially since it was a code and listed as a toxic substance. I wanted to know what we had on board; and there seemed to be some critical information missing. The ramp agent stated he had loaded only one item of DG; a 'can' with 35 pounds of dry ice in it. The dry ice was shown on our final DG report; though with a weight of 33.95 pounds; not 35. Calls to Dispatch; load planning; operations; and the DG planner did not yield any substantial information about this item; particularly if it was even on board and why it did not have a weight listed. The DG planner also found it unusual to not have a weight listed for the toxic substance listed. During that phone conversation; I noticed that the AWB (Airway Bill) number was the same for both the toxic substance and the dry ice; but I also did not see that these were listed as 'All-In-One' on the DG report; but they were each showing 'Overpack.' The FOM explains each (thought it could do a better job with that explanation); but since I had two items listed as DG I would have expected to see 'All-In-One' indicating '/ Y' if the two DG items were packed together. This led me to believe that either the toxic substance was either missing; not loaded; the ramp agent/baggage handler incorrect in his assessment that only one item was loaded; or more likely; that the two DG items were in fact 'All-In-One.' Further; previous simulator training that incorporated DG on a flight that experienced an emergency necessitated us providing the drill code; location; pieces count; and weight to Airport Rescue and Firefighting (ARFF). In this real-life issue with the questionable DG; however; I would have been unable to provide a pieces count nor a weight for the item. With nobody seeming to know anything about the toxic substance; I made the decision to have the 'can' with dry ice removed from the aircraft. With only finite information about what the dry ice was intended to cool and the fact that the two items had the same AWB number; my estimate was that the toxic substance was inside the 'can' with the DG; and that the DG report was not complete; or at least missing critical information. The can was removed; the DG report corrected to show both items as 'OFF;' new final weights sent; and the aircraft departed with no further issues.