Whenever I go through a security checkpoint, I keep my eye on my bags. If I am singled out for additional screening, I insist that my bags remain in view while waiting for a TSA employee to turn up.
These waits are the time you’re most likely to be separated from your belongings.
This insistence usually gets a response, in fact it usually limits the time I have to wait for someone to come do the additional screening. And at a minimum declaring that I’m watching closely may serve as a deterrent to theft.