The name "Gerson EISEMAN" does not appear in the CMSR for the 12th Louisiana Infantry, nor did I find the name listed in my 1920 print copy of Booth's "Records". The 12th Louisiana Infantry did not serve in Virginia, although most of Company K, 9th Louisiana Infantry which did was re-organized as Company M2, 12th Louisiana Infantry in the fall of 1862 in Mississippi.
Booth's "Records" does not contain an entry for "Jonathan SHEVER".
Booth's "Records" does contain an entry for "Julius ZORK" who was enrolled in Company E, 7th Louisiana Infantry at Camp Moore, Louisiana on 7 JUN 1861. He was present for duty on all rolls through the end of February 1862. Booth noted that he was born in Germany, a hat maker by trade and resident of New Orleans, Louisiana when enlisted, and 24 years of age.
Booth contains no further record. Your date of death record of 8 JUN 1862 provides additional information. Where did you get this?