Similar experience except it happened to me at National in SJC.

Unfortunately, the best way to track it down is for the car to be returned to the lot and hope nobody stole it. We got our iPad back after the car was returned, but in between, nothing could be done. Depending on the manager, they may be able to call the driver by tracing the specific car, but YMMV.

Hope you find it! I would reach out to the branch manager directly or PM SixtCSR on here.