Now, I'm not trying to defend Guliani or anything but it so happens I applied to help sift debris from the site, a job which to the best of my knowledge, remains unfinished today. So I have a teeny bit of insight on that. From what I understand there were areas of debris or fill, whatever, that had been declared free of human remains and some was removed and some remained onsite to become part of the rebuild, particulary a ramp for vehicles to gain access to the bottom of the hole. Well, when they went to remove this ramp as a next step in construction they found it did in fact contain human remains and personal effects. This was at least a couple years after the site had been declared remains free. Anyhow, I can't offer ANY info on what may or may not have found it's way to any landfill but I DO know that the mountain of debris that was still on site was removed to a facility in Brooklyn. There's been a big ongoing battle concerning how long it's taking to sift this out and that's when the call went out to surrounding archeological organizations for people with sifting experience AND a degree. Me, I submitted a resume to the NYC medical examiner's office several months ago and never heard back. I can only assume at this point that my meager experience and non related degree were not enough for them to consider me. FYI, the job site is treated as a HAZMAT site and to work there you get suited up, fitted for a respirator by the city, and do the whole NBC decontamination thing every day. The job pays $20 per hour DOE and they offered no break on travel expenses into the city so really they weren't (aren't) offering much to the kind of people they're looking for to get the job done.
The biggest bone fragment found to date (or last I heard) in the newfound debris pile measured only 4" long. A vast amount of ALL the human remains ended up microscopic in size making it virtually impossible to separate out EVERY bit of human remains. So you can pretty much be assured that ANY debris leaving the site and going to any landfill contained SOME human remains.