Cars being ‘tested’ isn’t surprisingl. I worked for a large Japanese dealership for a while and the servicing team always seemed to be borrowing cars – especially over the w/e. I used to do the drop-offs until someone twigged that as a 20year old I probably wasn’t (definitely wasn’t) insured for the cars I was ragging driving back to customers houses.
My dad left his large Merc company car at the dealership for a service – was told that he’d not be able to collect on the Friday due to some spurious reason, could he collect Monday? He picked it up on the Monday as required, slung his works boots, paperwork and golf clubs in the boot. Carried on his day. Finished early, got to the clubhouse and on removing his golf clubs discovered that someone had left a baggy of Bolivian marching powder in the boot.
To say he was unimpressed was an understatement. The dealership denied all knowledge – apparently, it had categorically NOT been borrowed over the w/e. The police confirmed it was coke, took it away but nothing came of it.