The piece doesn't show in the photos? So it can be in the mirror, on the focusing screen, or in the viewfinder.
Remove lens and look at the mirror, is there a spot on it? Use rocket blower to get it out of the camera.
If that is not it, look at the focusing screen, which is between mirror and viewfinder. Rocketblower is still the best choice. Never touch the focusing screen or mirror with your finger, it will leave residue
Finally, if it is none of those, it is in the viewfinder so there is not much you can do..
It could be dust or some of the inner lining, sealing getting loose. The main problem is that the camera might no longer be as light sealed as it was before. Hopefully you will not get light leaks or other problems. A 5ft droop is quite big, its good the camera survived at all! I would check its focusing, especially with the lens that was mounted when the camera fell. A fall can decenter the lens or even damage the mount, AF coupling
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