Walmart always tried this crap with me. Used to tell me what number I was in line. I'd sheet everything NR1 and leave. Get the Msg to return and I'd come back 1 minute before the receiving closed. After 3 weeks of doing this every day they started dropping 2 pallets at my truck as soon as they saw me.
A week ago I had to deal with a customer in a apt on the 5th floor. He wanted to ship out 17 boxes and needed labels. I dropped labels off 2 hours before the pick up time. When I returned he wasn't ready. Put NR in the pick up and left. When he complained and they told me to come back. I showed up at 845pm with a big smile on my face.