The break-in apparently occurred last weekend, The Atlanta Journal-Constitution reported Friday.
A police report obtained by the newspaper showed Aaron, 79, missed a call from his alarm company Sunday night and asked a neighbor to check his house Monday morning. The neighbor called police after coming across a broken window at Aaron's house. Investigating officers then found parts of the home had been ransacked and two BMW's were gone, the newspaper said.
The police reported stated electrical wires had been cut and the home's alarm system had been damaged.
Jewelry and the cars, which were later recovered, were the only items taken, the newspaper said.
"We are following significant leads and anticipate an arrest," police Sgt. Greg Lyon said.
Aaron, who played for Milwaukee and Atlanta, broke Babe Ruth's record of 714 career home runs on April 8, 1974, and finished his career with 755 homers.