Do you disconnect Dash cams before taking a customers car into your workshop.

I had my car into the dealers about three weeks back, Last Saturday I was involved in a minor collision (I was rear ended, No damage) I decided to check the dash cam and found that it had been unplugged, I had nothing. Lucky it wasn't something that I needed evidence for.

Is this standard practice to unplug customer owned equipment, nothing to do with the reason the car was in the shop and then leave it unplugged.