which reminds me that my son said his work van was electronically "broken" in to, he only realised it when a piece of kit he wanted turned out not to be there and nobody else in the company had used it. It seems that lots of electronic keys had been cloned, or a manufacturer's universal code had got out into the underworld.
Someone inside the industry told me this, with particular reference to Transits - I can't substantiate it. For delivery, they can be opened by either the coded key the customer eventually gets, or a universal key. The universal key is used for delivery and moving around in storage obviously to avoid the distributors' staff having to have loads of keys.
What should happen is that, before sale, the dealer deletes the coding for opening by the universal key, but sometimes this seems to be overlooked. Anyone with a universal key can then gain entry.