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Buck. But I would also bet he is not one of those you have on camera. Those in the first two pictures look like they were made by eye guards. Also doubt its elk due to the height of the marks.
The first two do look like rubs that, pic 3 hard to tell they do look really deep in there, if it was a deer most be something big. but just guessing
Elk do not have canine teeth or incisors. Both of which are referenced to teeth of the upper. mtncook