Police officers have seized items believed to have been stolen from vehicles in Dore and Totley.
They have released a photograph of some of the items, including an Apple laptop and Tom Tom sat nav.
It is believed they may have been stolen over the last two weeks.
A South Yorkshire Police spokesman said: "Have you had your vehicle broken in to recently, Possibly around Dore and Totley?
"These items have been recovered and investigations are currently continuing to reunite them with their true owners.
"Please get in touch if you recognise any of these items as belonging to you. There may be a little test to determine if you are the true owner or not."
Call South Yorkshire Police on 101.