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That'll be my next trip. There are only 2 or 3 in the neighborhood and I put it on Nextdoor also. Probably left it sitting on the roof after opening the door.
They are so cheap, I doubt the owner is going to worry about it once they figure out how to get in and going. I bought three from mobile service for $15 total. Now that they are programmable by users you should just re-program it for your car.