I'm afraid that the quality of the picture of the marks is too bad in order to say anything. I must say that I find it very difficult to understand why good pictures cannot be shown. It is more or less impossible to either see or guess what the mark looks like. Therefore a 100% proof answer can not be given, not even 50%.
As an example this is how pictures of marks should look like. I have a normal Nikon camera with 50mm lens. I also use a tripod. Then take a picture a the closest range you can. Then cut it down and re-size it in the program that came with the camera or any other photo program. Below you see how it should look like. Only with such pictures you can expect some reliable answers. Thank you for reading this and have a nice Sunday
