It's more like saying "I left my car in a shady neighborhood unattended for 72 hours with the doors open and the key left in the ignition but I haven't been kee

It's more like saying "I left my car in a shady neighborhood unattended for 72 hours with the doors open and the key left in the ignition but I haven't been keeping track of the millage or the fuel level so I'm not aware that anyone used it while I was away." Nothing would have stopped someone from using it. Probably best to assume that they have.