That’s what is called hyperbole. There was a little under 3,000 people killed that day; in the air, at New York, at the Pentagon, and in a field in Pennsylvania.
Some bodies were not and cannot be recovered, though. That part is true enough.
That should be body parts not bodies. No coffee yet. This article explains it well: http://nypost.com/2014/05/18/outrage-over-911-museum-gift-shops-crass-souvenirs/
gotcha Im a dense old clod -