Unnamed young man says he was toddler who went missing in 1955 . Year - old William Damman vanished from in front of a Long Island , New York , house . Toddler 's father : ` ` You never give up hope , [ but ] things dim after all those years '' A few years back , Steven Damman 's sister gave a DNA sample in connection with the 1957 Philadelphia case of a young boy 's body found in a box . The FBI is conducting DNA testing , says Nassau County police officials .
Unnamed young man says he was toddler who went missing in 1955 . Year - old William Damman vanished from in front of a Long Island , New York , house . Toddler 's father : ` ` You never give up hope , [ but ] things dim after all those years '' The FBI is conducting DNA testing , says Nassau County police officials .