In "Fragile-Contents Death," a postmaster receives an anonymous call informing of a deadly delivery.
Postmaster Jordan arrived at work expecting an average day around the post office. Suddenly, he receives a phone call. The man on the phone won't give his name, but he tells Jordan that a time bomb has been sent though the mail. The bomb was meant to go off after it was delivered, but the sender made a mistake and set the wrong time. That means that the bomb will probably go off while it is in the hands of the postal service.
They have five hours until the bomb goes off. Can they find the package in time?
"Fragile-Contents Death" was written by John F. Suitor and produced/directed by Elliott Lewis. Paul Douglas starred. Also appearing were Lou Merrill, Howard McNear, and Joseph Kearns. This episode aired on February 1, 1951.
(Image of Paul Douglas from Wikipedia)