Last name spelled with ey instead of just y but I think this is the same person. Leeper was in the 68th also but in a different Company.

POLLEY, WILLIAM C.
Rank: Private
Conflict: Civil War
Side: Union
Type of Unit:
Organization: Enrolled Missouri Militia
Name of Unit: 68th Regiment E.M.M.
Alternate Unit Name:
Company: K
Period of Service:
Commander:
Note:
Record Group: Office of Adjutant General
Series Title: Record of Service Card, Civil War, 1861-1865
Box: 66
Reel: s804
Polley's card say's enrolled at Greenville, Apr. 30, 1864. Private, Co. K, Capt. Powers
William T. Leeper enrolled at Patterson, Apr. 30, 1864.
Private, Co. F, Capt. Hodges