I was going based off of what I remembered from a discussion last year concerning not theme decks necessarily but the starter deck. I made the post prior to finding the thread but was now just able to locate it:
www.elitefourum.com/t/no-rarity-japanese-base-set/11607/1
I replied on an assumption that I had remembered right, so I apologize. That was my bad.
However, there still seems to be a lot of mystery on whether or not the first starter decks ran with no-rarity symbols but it seems likely to say that, if one did, there’d be some evidence by now. Especially since, you generally being an expert on this kind of stuff, have not seen any.