Yes, you never know who's watching.
Happened to my ex-husband and I some years ago - first trip to Queensland, had a hire car (really nice Toyota Camry), went to Dreamworld on our first day. Parked the car at 10am and decided it was going to be too warm to wear jackets, so took them off and put them in the boot (my ex didn't want to leave them in the car, as it might look like they were covering up something valuable). Came back out at around 4pm to find the driver's window smashed and the bonnet popped open - we assume they'd been trying to pop the boot instead, but there was no internal release lever for that. There was a note from the security patrol with a time of 10:30am so someone must have been watching, then broke into the car almost straight away. Nothing taken as of course as we hadn't left anything in the car, but a PITA otherwise as we had to go to the police station to make a report, then off to the hire car company where we ended up with an absolute piece of cough Camry for the rest of our holiday
.
My work colleague and his wife went for a drive in NSW up to the Blue Mountains and she didn't want to carry her handbag when they went for a walk (I'm female, but I still can't understand the obsession so many women have with taking their handbag EVERYWHERE, even when they don't need it), so when they parked, she hid it under the passenger seat and off they went. Of course, to anyone watching it would have been quite obvious what she was doing and sure enough, they got back to a smashed window and stolen handbag.
Both incidents happened 25-30 years ago, so even back then your valuables weren't safe.