The Library of Congress has confirmed my discovery of four human remains in a photograph of the Wounded Knee Massacre aftermath. An excerpt from their reply follows:
Upon viewing the high-res TIFF file we made of the file, the human remains are quite visible, indeed.
Thank you very much for contacting us regarding this image, and for your interest in our collections. You can imagine that among a collection of 14 million items here, there are a lot of secrets waiting to be uncovered!
So there really is something to be said for scanning historic images into high resolution files, and digitally restoring them.
Am writing to historians to communicate the discovery. Will update as new developments occur.
Many thanks to the Library of Congress and the Wikimedia Foundation for making this possible.