Why American's don't celebrate Boxing Day
I doubt too many U.S. residents have heard of Boxing Day. They celebrate this holiday (Dec. 26th) in the U.K., Canada and Australia, and probably other places.
This site explains
Boxing Day takes place on December 26th and is only celebrated in a few countries. It was started in the UK about 800 years ago in the Middle Ages. It was the day when the alms box, collection boxes for the poor often kept in churches, were opened so that the contents could be distributed to poor people. Some churches still open these boxes on Boxing Day.
Dec. 26th is a normal work day in the U.S. Some places close the office (especially this year Christmas is on a Thursday), but generally it is not considered a paid holiday, but might be used as a "floating" holiday, or maybe you just have to count it toward your vacation time off. American companies are not terribly generous with paid time off.
Furthermore, neither Christmas Eve nor New Years Eve are considered official Holidays in the U.S.
Just be happy you have a job.