Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Other / Unknown
Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Weight And Balance; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Human Factors
Conducted a standard preflight DG inspection. Post flight;  was made aware of a dangerous goods discrepancy via an email forwarded from the Duty Officer.  The email stated [the] Flight arrived this morning with unmanifested IDG in the AFT belly; there were also three boxes of dry ice loaded into A1. After  pulling the airways bill numbers for these packages and they showed no scans to the flight. The IDG [Inaccessible Dangerous Goods]  container; had not been assigned to the flight either and was loaded in position X. The Sort DG Manifest was in the pouch of the container but there was no card showing anything loaded.The cause was Improper manifesting and handling of cargo.[I suggest] additional training is provided to cargo loaders and Dangerous Goods personnel.
I was informed via company email by the Duty Officer of undocumented DG loaded in the aircraft that was discovered during offloading in ZZZ1. [The cause was] ramp personnel loading unmanifested DG in ZZZ.[Suggest ramp] not load unmanifested DG.
Flight crew and Dispatcher reported receiving email from Duty Officer regarding unmanifested inaccessible Dangerous Goods on board on a previous flight.