Replacing an engine at the factory is not fraud and does not need to be disclosed. There are many repairs done to vehicles in the plant for a variety of reasons, none of which are disclosed to the eventual buyer. The plant buys off on the vehicle as complete as ordered and safety and emissions certified and basically sells it to the sales arm. If there is damage in transit, then local and state laws take over as to what needs to be disclosed to the buyer, for example, in Michigan, more than $750 in repaired shipping damage needs to be disclosed.