His SOS service card is here:
http://www.sos.mo.gov/TIF2PDFConsumer/DispPDF.aspx?fTiff=/archives/AdjutantGeneral/Civil_War/ServiceCards/s860/1318.tif|/archives/AdjutantGeneral/Civil_War/ServiceCards/s860/1321.tif&Fln=S190451.pdf
Sadly many of those that died at Paducah were initially buried there and then re-interred at Mound City. Some 2700 are so unknowns are subsequently at Mound City and I'm afraid Samuel Lance may be one of those as I could not find a VA graves listing him by name.
John R.