A lot of people may have not been reported: Families Of Undocumented Immigrants Lost On 9/11 Continue To Search For Closure

For years, the people at Tepeyac and other families have been trying to prove the immigrants who worked at the World Trade Center existed. That effort has proved to be extremely challenging.

How do you prove a person, who deliberately had tried to stay hidden from the system, was real without the proper documentation?

Garcia and the others could see a bureaucratic nightmare beginning to unfold and they got to work. Tepeyac started sending folks to look through missing people's homes, she says, to look through their personal belongings, "to see if they had a passport, a birth certificate, if they sent money with names [on the order]. And it was real difficult, because people weren't using their real identities."