We came home after a long bank holiday away and found our car glovebox etc had been searched by thieves. We don't keep anything in the car so they only left with a phone charger. No damage thankfully. We'll be double checking the car is locked from now on, others may wish to do same.
If you lock the car with clothing inside a thief will smash the window. They'll also smash it to check the glovebox; someone did a row of 10 cars in our street a few years ago.
Best is to leave glovebox open (empty of valuables of course!) so that they see it and just pass by.