I absolutely concur, and I advocate for the same approach during collecting; yet, most individuals rely on the assumption that the workshop will adequately safeguard their belongings, and fortunately, the overwhelming majority of workshops do indeed exercise necessary care.
I have experienced a single incident of damage to a vehicle while it was in the dealer's custody. My wife's nearly new MINI Cooper S was delivered to the main dealer on a Thursday for warranty repairs but was retained over the weekend pending parts availability.
Upon collection the subsequent Tuesday, I observed the damage and promptly reported it to the workshop manager, who requested time to do an investigation, which I deemed reasonable. The next day, he returned to me, refuting any claims of misconduct regarding the car while their custody and, in a kind manner, insinuating that I was fabricating the situation. His demeanour shifted upon my revelation of the contents discovered in the glovebox: a map book that did not belong to me, accompanied by a pivotal parking payment ticket, date and time-stamped, featuring the vehicle's registration number for a location approximately 25 miles distant on the Sunday during which they had custody of the car. Extensive apologies were issued along with a goodwill gesture, and the damage was rectified at their expense, so resolving the issue.