That's an oh-so-beautiful puzzle piece maybe falling into place, but still some missing pieces around it.
Since Milky Oxbloods are so different from Silver, I didn't have a good idea of what they might be called or when they might have been made/sold. I have seen silver in original packaging, but only had a "maybe" (that I can recall) on milky.
Now ... do we have ads showing Hy-Grade .... trying to recall ....
"One of these days" I need to make a big poster on my wall to help me keep all this stuff in place. I have a better than average memory much of the time, but lately it needs some help.