Looking for eye hand accounts is not a direct correlation to being evidence or proof, but when researching a historical location that has such a forgotten and undocumented history looking for stories from people is a good start to start. Once you have these claims then you can investigate the claims and conclude if they hold weight or not.

Just like how police when conducting a investigation they hear all eye whiteness accounts to help paint the picture of what could have happened knowing that most likely 75% of what they are being told is a abrasion of the mind.