At another Post Office, following the Presidents Day holiday, no postal clerks bothered to show up for work. While the building was open, there were no postal employees present to serve customers.
During the Christmas rush Amazon stopped delivering to your home as usual. They would use USPS where I live. And USPS would not deliver either. You had to go to the Post Office.
The line of customers lining up to get their packages was terrible. Waits of 30-45 minutes were normal.
There were only two Amazon lockers nearby. If your package was too big, forget it. It went to the post office.