I never leave anything in the cart period unless I have done my best to protect it, e.g., a lockable bag over my clubs. That is far from fool proof, by maybe they go to the next cart.
Even when I do that I will take my laser range finder into the bar with me as it is the most expensive thing in my bag
PS. I have had a set stolen from the parking lot at Mallory (before I locked them). The perpetrator, a grandchild of a Villager. I read/heard from detective he was a pretty good golfer. He would get gramdpa's cart, sneak on a course, when he got kicked off he would leave through parking lot and take a club or set (back and front lots). He did this 18 times before he was caught.