Cashcard is a must to take out as most dealers prefer not to
have any misunderstanding. In fact some customers take out cashcard but leave their notebook and bunch of coins and some notes in the tray.
Why do you worry about losing a few coins or some coupons when there are more important things to be aware of?
To me, i am much more concerned how the mechanic does up the car. I am also careful not to send to the wrong branch for servicing in case of hanky panky. Do not think that large dealers for prestigious continental cars will not have hanky panky. it happened to one of my cars. i called the mgr and was told it happens sometimes! i wrote in and they compensated me though i told them i had no intent to ask for any compensation.
So now, when i send car for servicing, i will tell them exactly what to do and i will request to be in the car for test drive. Reason is, a test drive can send the car to backlanes workshop to swoop parts or steal petrol. It happens and i know which are the ones.
I am not calculative if they steal some petrol or even pinch off my cash card or take some cash out of the coin box, but if they dare to swoop parts or damage my car through an external job, i will pursue the matter and make sure that bugger gets sacked.
So, its a matter of luck sometimes if you do not know much about cars. This is how much i will share here.