Federal law prohibits most civilians from owning fully automatic weapons, making them desirable collectors items.
A property tag on the gun case identifies Beard as the guns' owner. The documents have been turned over to federal agents investigating corruption at Atlanta City Hall.
Beard’s attorney, Scott Grubman, disputed that Beard ever took personal possession of the weapons.
“Findings from the ongoing investigations continue to be disturbing,” Moore said in a prepared statement.
Beard left city employment last year.