The first answer is one way that the rental branch would find out. Other occurences such as tickets, breakdowns, and excessive mileage can also lead to questions. We here at Enterprise, do not have tracking or locators on the vehicles. Honesty, we, find is the best policy and we trust our renters who do go through ID checks and other standard verification at the local branches. You can always contact our help line at 866-324-0810 with any other questions. Chris, Social Media Monitoring Dept w/Enterprise Holdings.