Instances have been reported in Lichfield of people trying door handles to see if they are locked, and items have been taken from inside unsecure vehicles in some cases.
PCSO Deryn Small of the Lichfield neighbourhood team said the force had received numerous reports of incidents and issued a reminder for people to take more care.
She said: “We are issuing a general reminder to ensure that you lock your vehicle when you leave it unattended and to remove any belongings and tools you may have in the vehicles.
“Please report suspicious activity to police on 101 or 'digital 101' in a non-emergency, and call 999 in an emergency.”
Staffordshire Police has also issued a list of steps members of the public can take to ensure they are not targeted by thieves during the lockdown.
These include always locking the car, securing number plates and anything outside the vehicle, taking things out of the car or hiding them from view, parking in well-lit areas and protecting any tools left in a vehicle.
The force has also issued a series of guides to keeping vehicles secure on its website. For more information, visit staffordshire.police.uk/cp/crime-prevention/theft-of-a-vehicle/vehicle-attracting-thieves.