LOL I started at UPS loading trucks but once I learned all the zip codes they moved me to what was called small sort which was small size packages like you had and there were some heavy ones too. I've forgotten most of it now but at one point I knew every zip code in Illinois, Michigan, Iowa, Wisconsin, Indiana and Missouri. It's all done with ar codes now.
I played plenty of pick up games too growing up in the 70's. Pretty much every sport. It was the girls that used to come out and watch us that corrupted me after hours.