Having been in managment for over 27 years and being accountable for hours worked by employees, if this unfortunate casualty of UPS was not found for 2 hours, then someone was not doing their job.
Be it the shifter or feeder driver? I don't know, as I never worked in feeders.
The management person is held accountable for hours worked, for their operation, had to audit the timecards for a post sort meeting. And if an employee had not punched out as expected, then someone should have known their whereabouts, and looked for the employee, prior to the next sort.
JMO