Missing property

My vehicle went for 15000km service. I had my music on a flash drive, which I left in the USB port. When I returned to collect the vehicle I realized the flash drive wasn't in the usb port. I enquired about it, they had taken photos of the entire car, and had a picture of my flash drive in the USB port . They said they would get back to me,it's been 2 days and still I haven't heard from them. I won't be dealing with them again.