Victims reported the car break-ins Wednesday morning, and at least three said the incidents occurred overnight, according to Richmond County reports.
The fourth victim said her car, containing the missing backpack, was broken into between Friday and Wednesday morning.
Two vehicles were not locked – the one with the wallet and another from which nothing was stolen.
The vehicle containing the .40-caliber Smith & Wesson gun had marks on the driver’s side door where a device was used to gain entry, police said.
The car break-ins were in the 5000 and 5100 blocks of Wheeler Lake Road off Wheeler Road in west Augusta.