Due to various reasons, the recipient did not receive this parcel, and the sender did not retrieve it either. When selling these parcels, the Sky-Faring Commission scans them in advance to ensure that there are no dangerous goods (or excessively valuable items) inside.

"Mystery boxes like this are scams. Last time, I opened five boxes with expired mung bean sodas in a row..."
"How did this not get flagged as a dangerous item during the screening process!"