Someone messing with my car?

Hi! So sorry, I had no idea which group to post this in. My boyfriends car is currently out of commission so I’ve been letting him borrow my Jeep. It’s got some work done to it and definitely doesn’t go unnoticed. He works in Philly and isn’t in the nicest area. Today when he left work and got on the highway the hood was unlatched and flying up so he had to pull off and fix it. He said he was worried someone was trying to tamper with the engine or something. We cant figure out why someone would be inclined to lift the hood anyways. I’m just worried about him taking my car to the city all the time. What do you guys think? Overthinking? I’ve had the car 2 years and have never experienced that.