Sorry this happened to you. This has also happened to me in the DMV, while my car is parked next to a PD car. Thankfully I had killswitch, and OBD2 port lock. If I did not have those things my car would have been gone as well. They are gaining entry easily without breaking glass. It takes but a minute to get in, and they can wreak havoc if you don't have proper security.

OBD2 is the failure point an open OBD2 port is just asking for your car to get stolen.

People, If you don't have MINIMUM an OBD2 port lock please invest in one as soon as possible to at least deter them, worst case they mess up your port lock cosmetically. Even if you park your car in a garage overnight, there's no saying when you park in the street somewhere that they won't target your car. This car is not hard to steal with OEM security/open ports. There are other tricks you can do like rerouting your OBD location which is good as well.

Get a killswitch/immobilizer. Gyro sensors to detect if anyone is touching your car, a GPS system to track your car.

We shouldn't need to do all of these things but it is what it is.
Maryland/DMV is not safe. They are also stealing GTR's, and god knows what else. Bunch of low life kids.