Don’t collected the valve stems. That’s property damage and it’s illegal. Instead, buy a box of valve stem caps and a box of small BB’s. Glue the BB’s inside the caps and swap them out with the ones already on the nuisance car (tape the old ones to the tailgate so you aren’t stealing), and go on about your day. It’s gonna take them awhile to figure out why their tires keep deflating because nobody checks that caps, and it takes less than 30 seconds the bend down and “tie your shoe”.