I hate it when they do this, when I had mi wheels refurbed on the 2i, I took it for valeting before Ford Fair (I was eight months pregnant and really couldn't be bothered cleaning it miself -

)
When I got it back, they'd been out in it and one of the alloys was kerbed....
Last year, I took it for some temporary welding doing to the inner sill just to get it through the MOT. The garage that had it, again took it out (mileage checked) and when I got it back, they'd done sommat to the suspension driving it up the very rough road/track they had to the garage.
Surprise surprise... when we rang em and tried to confront them, they locked up shop and went home....