Maybe you need a security camera. It can have been anyone, including neighbours, their visitors, or of course also the driver (dishonest drivers are also in other companies though), but only because the parcel disappeared it does not mean it was definitely the driver. The photos they take don't really prove much, as some people say they believe the driver took a photo and then walked away with the parcel. I have seen people say that... You need a security camera if you want to be sure.