footprints.
Was this a naturally occurring event on the beach, where shells were washed to shore and just happened to stop in that exact formation?
If comey didn't do it, he was there while it was done. Sand on a beach doesn't say undisturbed for very long.
He just happened to pass by, and just happened to have a camera.
https://www.bbc.com/news/articles/c04ezlyq4y0o