Most, if not all, of those same records, I had in my own hands. They are Jobete Music acetates, which were just made soon after they were recorded, just to prove ownership of the publishing rights. The particular artists who sang them were not important, to prove publishing rights ownership. So, the artist name was never written on that type of acetate. Yes, the artists' names were added after 1980 (which was the last time I saw them at Motown). They started "disappearing" from Motown, and appearing on auction in the late '80s and early '90s. There were usually 2 Jobete Music acetates made for each song, from what I remember. From 1961-69 or so, the cloudy, creme-coloured label with red ribbon, typewriter typed song titles, were made for proof of Jobete Music ownership. In addition, there was or were often one or two, or even more, Motown Corp. acetates and one, two or more vinyl studio demo records pressed for each song. Motown acetates and demos usually (almost always) had the artist listed as well. Those virtually always used black type. Some Motown acetates were made months, and sometimes, years later. Also, many non-Motown (bootleg or personal) acetates and studio demos were made many, many years later, but are sometimes sold as "original Motown recordings, from the year of original recording". Beware of those.