Csi (Crime Scene Investigations) Would Be Pleased :)

After more than ten years outside of coin collecting, I finally revisited my small collection. Last night, I pry open one of my 4-Reales on a black Daymount self-sealing black 2.25x2.25. To my amazement, I found a set of thumb and index finger imprint (as well as the high points of the coin) on the inner vinyl window. These were not my prints, but could be that of the dealer. :) No visible imprints on the coins itself. Good think these are not those high-priced AU/BU varieties.

Obverse shows the index print.