With regards to my previous question, What happened to Gustav Adolf Neumann, 1859 immigrant to the US? and despite the very good answers, it seems like my ancestor, Gustav Adolf Neumann (born on October 27, 1824 in Leipzig, Saxony in Germany and who reached New York on Jan 17, 1859) is nowhere to be found, see more details in post linked above. He seems to have perished in the black of history.
I have found no traces in the 1860 census. Interestingly, the 1870 census offers a person, which - based on his birth year - could be the one. However, his name does not match entirely. Then, the 1880 census does not have again a Gustave Neumann in Missouri or any other close match.
I have checked for naturalisation, but they are very ambiguous as most (all?) of them do not show the birth year/birth date of the persons.
I checked several death/marriage databases all on familysearch.org, but to no avail.
I was searching on all databases for Gustav Neumann, Gustav Newman, Adolf Neumann, Adolf Newman, Adolph Neumann, or Adolf Newman with the birth years 1824 to 1825 each time.
Does someone has a clue, an idea where to look at? Was I rushy, did I overlook something?