Mmmm. If you left the keys with them I would interprete that as someone having been at least playing with the car while you were away. Worst case is that they took it for a spin & reset everything hoping you wouldn't notice. Possibly fiddiling with the clock accidently while scrolling through the MFD's.
If you get any nasty letters from speed camera's, parking fines, etc. over the next few weeks, you'll know for sure.
If you get any nasty letters from speed camera's, parking fines, etc. over the next few weeks, you'll know for sure.