Watched the one with Thomas Nealy. His acting was really bad and catching the Slender man on tape is also too unlikely to be taken seriously, but to be fair I also went to NamUs to search their data base of missing persons- no Thomas Nealy is missing. Sleep well the Slender man is a hoax most likely.
"There is only one God and his name is Death. And there is only one thing we say to death "not today" - Syrio Forel