When and Where was he born? Was he married? Who, when, and where? Do you have a death date or place?
In the meantime, I found the following on FamilySearch.org:
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J F Buck Casper
United States Census, 1940
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birth: |
1903 |
Oklahoma |
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residence: |
1940 |
Safford, Supervisorial District 1, Graham, Arizona, United States |
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Buck Casper
United States Census, 1930
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birth: |
1904 |
Texas |
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census: |
1930 |
Precinct 1, Cottle, Texas |
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parents: |
Jno W Casper, Laura Casper |
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https://familysearch.org/search/records/index#count=20&query=%2Bgivenname%3ABuck~%20%2Bsurname%3ACasper~
Hope one of these is the person you're searching for. 
