And if I can just add that there is no way we can provide useful short stories here without checking some facts.

"It was one Mr. Roberts that actually came up with the whole idea of the zip code. This man was also a staff of the United States post office department."

You might want to check your research again, particularly if you want your work to be useful to teachers.
Robert Aurand Moon, postal worker, born April 15 1917; died April 10 2001. Moon was the man who invented the [US] nationwide postal code. Perhaps you got confused, as you don't mention his surname at all.

"In 1962, President Kennedy appointed an advisory board to cope with what was rapidly turning into a crisis, and Robert Moon was at last able to ride his hobby horse. At the time, he was a postal inspector in Philadelphia and had been tinkering with various distribution schemes for 20 years. There were already rudimentary post codes in major cities around the world, of course, and Moon had unsuccessfully offered two improved versions to the US postal authorities. However, his final version was grabbed by the advisory board and put into operation on July 1 1963."

http://www.guardian.co.uk/news/2001/apr/21/guardianobituaries.haroldjackson

"Every thing on earth surely has an origin."

Yes indeed, and more research would show that Rowland Hill was the originator of the postcode in the UK which was used as long ago as the 1850's. He also invented the postage stamp. UK postcodes, as we would recognise them today, were introduced by the Royal Mail from 1959 to 1974.