The front page of the Lancaster Eagle-Gazette on January 16, 1954, after a baby boy was found in a telephone booth. Washington Post photo by Meagan Flynn

Washington - Steve Dennis's birth certificate didn't say where he was born or when, or to whom. It just said he was found in a telephone booth.

Two bread deliverymen had found him there early one January morning in 1954, back when Dennis didn't yet have a name. They found the "big blue-eyed infant" wrapped in blankets inside a cardboard box in the phone booth just outside Yielky's Drive-In near Lancaster, Ohio, the Lancaster Eagle-Gazette reported at the time. There was no telling how long he had been there, perhaps only a few hours. The baby was very cold to the touch, the paper reported, and so was the bottle of milk left with him in the box.

The mystery soon captivated the residents of Lancaster. In just two days, dozens inquired about adoption, and "literally scores of persons" tried to help police identify the baby abandoned in the phone booth, the Eagle-Gazette reported in 1954. Nobody knew who put him there or why, and for a long time in the decades that followed, Dennis didn't know either.

But that changed when his two children, 18 and 14 years old, started asking questions.

"They're always really curious about, Dad, you know, where are you from? You know, what is your heritage?" he said from his home in Phoenix in a video interview published by the Arizona Republic.

They decided that Dennis, a retired chiropractor, would submit his DNA to the website Ancestry.com to find out.

Lancaster E-G tweeted "A DNA test solves a 64-year-old mystery about how an infant was abandoned in a Lancaster phone booth in 1954."

And it was about to help Dennis find his mother.

Within three months of submitting his DNA to Ancestry.com, he got an email, he said in his interview with the Arizona Republic. A first cousin had "matched" with him, the cousin said - and he believed he knew Dennis's mother.

"He said, 'You know, I think I know who your mother is,' " Dennis said in the video. " 'We've heard throughout our lives that there was a baby that we were related to that was left in a telephone booth. It was just like this hidden secret.' "

The cousin put him in touch with his half sister, who then contacted their mother, Dennis said.

By then she was 85 years old, living in Baltimore and at first had a hard time remembering all the details. But slowly, "week by week," Dennis said, it came back to her.

Dennis was reportedly told that she gave birth at age 18 but that his father gave her an ultimatum: They could only marry if they left the baby, the Eagle-Gazette reported. On a drive through Ohio from Kentucky, where Dennis was born, his birth father allegedly made the decision himself, taking the baby and leaving him in the phone booth.

"After the baby was gotten rid of - myself - he disappeared," Dennis said in the video. "Nobody knows where he went. So these sisters are half sisters. But to me that's a lot, because considering growing up an only child, it's better than nothing."

Dennis said he will be traveling to Baltimore to meet his birth mother later this month and "will take whatever she gives me and leave it at that, because you can't hassle an 85-year-old woman, of course."

He would have liked to learn his birthday, he said, but was told the date has escaped his mother.