Unless someone gets first hand knowledge (e.g. knows the person(s) involved and what they've done, or had one as a childhood pony), we can't know for
sure, however I also hold with hathorcat's comments about MOC Argies - there have been SO many MOC/MIB Argies over the years, especially during the glut years, that you would think that at least one would have shown up in packaging, and they haven't. Plus they are usually on body/hair combos that already exist as cheaper Argie ponies