I Am Looking for Charles Robert Nicholson Born IN Indianapolis Indiana

Charles Robert Nicholson was born 27 February 1867 in Indianapolis, Indiana to William Nicholson and Mary, Minerva, Maggie wallis. He married Cora Charlotte Arlidge in 1892.

Charles is a mystery to us. I am beginning to believe that he did a great job of hiding his troubled childhood. We know for sure that he and Cora were married in Wyoming. We also know for sure that he passed away in 1932 in Casper, Natrona, Wyoming. I have followed him on the census records for 1900, 1910, 1920. I lost him in the 1930 census or perhaps I just have been too narrowly searching. He and Corah/Cora had 6 children one of whom passed just after she was born. I cannot find a birth record or a census records of 1870-1890.

Does anyone have any ideas of where I could look next?