I didn't find any listing for them in the cemetery book. I did find this listing for a 1909 Macon, GA directory. I don't know if this is your family, but if so, they may be buried there.
Name: Charles F Shepperd
Gender: M (Male)
Residence Year: 1909
Street Address: 79 Wilder S M
Residence Place: Macon, Georgia
Spouse: Laura L Shepperd
Publication Title: Macon, Georgia, City Directory, 1909
Sorry that I could not be of more help.