Thieves stole a BMW and a Volkswagen Golf after breaking into a house in Sheffield to steal the keys.
The vehicles were taken from outside a house on Dobcroft Close, Millhouses, between 1am and 8.30am on Saturday, June 6.
The BMW has since been recovered.
Anyone with information should call South Yorkshire Police on 101.
Crimestoppers can also be contacted on 0800 555 111.