White box from the beginning
First, let us define a white box server. A white box server (sometimes referred to as a beige box) is a machine without a well-known brand name associated with it. White boxes are usually made en masse by Asian original design manufacturers (ODMs) such as Quanta, Wistron, Inventec and Wiwynn. They are also produced by system integrators who build systems assembled from parts purchased separately to create bespoke systems.
OK, so where do black boxes come from? In the traditional IT procurement model, enterprise customers buy from original equipment manufactures (OEMs) such as HPE, Dell and IBM. The OEMs in turn outsource the manufacturing of hardware to the ODMs. It is at this point you are buying a branded, closed, black box server.