I'm pretty sure those screens were not from the floors impacted by the planes. I had a friend that worked on 103, they found his body about 1 month later. I also had 3 other friends that worked on that floor, as far as I know no remains have been identified for two of them, and the third I think it was about a year before some piece was identified.
While you worked in the pit I'm sure some amazing things were found, but there must have been logical reasons for their survival such as positioning before the collapse or protection from a void combined with no fire or water damage damage.
Women's shoes. We found more of them than of any other item I remember.