Lost black leather briefcase containing a MacBook Pro and important documents in the 34th Street subway station, New York City.

I lost my black leather briefcase in the subway station at 34th Street in New York City on November 1st. It contains a MacBook Pro, some important documents, and a couple of personal items that hold sentimental value. I realized it was missing after I got off the train, and I retraced my steps but couldn't find it.