A321
Communication Breakdown
Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors
We were unloading a ZZZ1 inbound [on date] we were short a fleet service clerk initially when the flight arrived; because the other clerk did not show up to the gate. Crew Chief did not give no upload sheet; did not notify that there was a Dangerous Goods package in aft bulk. I realized the event occurred because I was called into the managers office for investigation. Two shop stewards were present.  The event occurred because of poor communication of the crew chief; and the other clerk not showing up on time for the flight. There was no briefing before the flight. They assigned me [late notice] and gave me a rover and I arrived to the flight with no pre-arrival briefing. Proper communication with the Crew Chief and a pre-arrival briefing.
Air Carrier ramp personnel reported being notified of Dangerous Goods package mistakenly left in aft cargo compartment.