S.C. Code Ann. § 7-15-375

The return-addressed envelope required by item (4) of Section 7-15-370 to be sent to each absentee ballot applicant shall have printed on its face in the upper left hand corner the words 'Absentee ballots for __________ County, __________ (county seat), South Carolina.' All blanks on the face of the envelope shall be filled in by the county board of voter registration and elections prior to the issuance of the ballot to the absentee ballot applicant. On the back shall appear blanks which the voter shall fill in with his name and address.