Doesnt this thread belong in the Joke section?
Seriously, a complaint about postal workers taking a day off being a personal inconvenience? Try using the machine in the lobby that allows you to print labels and drop your package in the box or better yet use USPS online and print your own labels in a timely manner that can be picked up at your home the day or week before Christmas.
In addition to our hard working government workers in LE, there are many thousands of workers your age working 24/7 in conditions you might find more than just inconvenient.