Would the real Giuseppe Ribera please stand up?

Francofonte, of the province of Siracusa, Sicily, is a small city with a population of about 13,000. About 15 kilometers north is Scordia, of the province of Catania, Sicily, a city of 17,000 people. Scordia is the hometown of my paternal grandparents, Giuseppe Ribera and Maria Pernici. In a previous post, I wondered about the possibility that my grandfather had a first marriage to a young women from Francofonte. The reason for suspecting this was the discovery of a ship's manifest (S.S. Calabria) that listed "Giuseppe Ribera" traveling to the New York with his young wife, Francesca Ippolito. The age of this Giuseppe matched the age of my grandfather, 25 years old.
The only other Giuseppe Ribera we found through the Ellis Island website was a 39 year old farm laborer from Scordia, traveling from Naples to New York on the S. S. Algeria on March 20, 1907. Grandpa Ribera's passport was issued on May 1, 1913, so the 1907 sailing was unlikely. Further, in 1907 my grandfather would have been 19 years old, not 39.
So it was natural to assume that the Giuseppe Ribera who sailed from Palermo, on the S.S. Calabria on May 1, 1913, was my grandfather. That possibility made me curious about this passenger's wife Francesca Ippolito. So like a good detective I sought more information. The ship's manifest listed Francofonte as the last residence of Giuseppe and Francesca. I applied to the "Ufficio dello Stato Civile di Comune di Francofonte" for copies of the birth certificate of Francesca Ippolito and the marriage certificate of Giuseppe and Francesca.

In a little over three weeks I received not only extracts of these documents, but photocopies of the originals. In addition, they sent me the birth certificate of Giuseppe Ribbera (sic) born in Francofonte on xxx 1888. Alas, this man was not my grandfather. The documents all use an alternative spelling, Ribbera, in the originals and in the extracts. I have my grandfather's birth certificate from Scordia. The date of birth, the city of birth, and the parents of the child are all different. These were two different Giuseppe Riberas born in neighboring towns in the same year.

The last piece of evidence that confirmed that the Giuseppe who sailed on the S.S. Calabria on May 1, 1913, was not my grandfather, was the fact that my grandfather's passport is dated February 6, 1910. The passport was valid for 3 years. That means that it would have been expired on May 1, 1913, when the Calabria sailed from Palermo. My grandmother, Maria Pernici, received her passport on March 28, 1914, and sailed seven days later. It seems likely that my grandfather, too, would have sailed much closer to the date his passport was issued.

That means that Francesca Ippolito was not married to my grandfather. She was married to a man named Giuseppe Ribbera, who was not my ancestor.

So I need to continue my search for my grandfather's ship and record of emigration from Italy. So far nothing comes up on any of the sites that hold records: Ancestry.com, EllisIslandRecords.com, and Footnote.com. When I receive my grandfather's Naturalization Papers that will include a Certificate of Arrival. The Certificate of Arrival will indicate the ship he sailed on, the ports from which he embarked and disembarked, and the date of arrival. This search for Naturalization Papers is currently being conducted by the U.S. Citizenship and Immigration Services.