FWIW, I was given a warning letter, that stuck, for delivering every package on my route and running scratch. I was off the day before, and a supervisor ran the route with a new hire and deferred the crap out of it. I think I beat my own route my 45 minutes.
This was over 20 years ago.
I posted the warning letter on the outside of my locker, and management could not remove it (not vulgar). I just recently threw it out when I was cleaning out my basement.
Good times.
Deferred delivery is nothing new.
The farmers on my route were not happy about it, since if they bought a part, they really needed it. I always took the hit for my customers.