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Here is a thought . . . another C5 owner. A neighbor down the street just bought a C5. One night in the driveway playing with our cars, our keys got mixed up and my key opened his door and vice versa. Although the key would not start the ignition in the separate C5s, we sure have access into each others car! Something to think about . . . . :flag
It's possible someone copied your VIN number,went to the dealer.They ran the VIN number and made a key from that info.The lift gate at your residence is just that.(1) person lifts the gate while the driver drives the car out.No big thing.Thats done all the time. The lift gate doesn't do a damn thing. The one at my house is lifted all the time when I forget the remote.Entering a car is the easiest thing in the world.Entring with the key is only a convenince.I see the tow trucks enter a car in about 6-8 sec..A slim jim is an easy tool to use with a little bit of practice. (STARS AND STRIPES FOREVER)
This sounds like the most logical explanation. Key copy, lift gate