So I'm a new part time preloader. I do a great job and my drivers say the same. I take pride in knowing I work at UPS. In the past few days, my new P/T supervisor had me stay a good 20 minutes after everyone else on my belt left the building. There were still packages behind every truck of those he released early. Today, my P/T supervisor told me to work my way down the line and load the remaining packages in others' cars. Nobody else was on the line. I know I'm new, but so are two others on my belt who have less seniority than I. They too, left early with the others (as packages remained behind their trucks). Should I work at an efficient, yet reasonable pace? Should I ensure all packages I load into my own trucks are done so safely, efficiently, and properly marked as taught? Am I without merit?