The nation’s last 24-hour post office window is closing. Beginning June 6, the downtown Chicago location at 433 W. Harrison St. will be open only from 7:30 a.m. to midnight seven days a week, said Mark Reynolds, a U.S. Postal Service spokesman. But if you want to mail packages at 2 or 3 a.m., you’ll still be able to use an automated, self-service center at the Harrison Street location. Chicago …
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