The thefts took place at an unnamed apartment complex.
So far two people have been arrested in the case, which police have said could be tied to a larger ring operating around the area.
Regina Sutton, 34, of Atlanta was arrested after police caught her in the act of stealing mail, the department said. Antwan Manuel, 25, of Atlanta was arrested by Atlanta police while allegedly driving a vehicle reported stolen out of Brookhaven.
Police have said the car was filled with stolen mail and credit cards, according to previous statements.
Sutton is charged with theft by taking and identity fraud, Manuel with car theft.
Anyone with information is asked to contact Crime Stoppers Atlanta at 404-577-8477, text information to 274637 or visit crimestoppersatlanta.org. Tipsters can also remain anonymous and be eligible for a reward of up to $2,000.