You don’t lean either way on authenticity? Like a coin flip?
I’m definitely leaning 96% towards authentic. There’s plenty of reason to believe that cards are all printed on sheets and some of those sheets that were printed as a test were never cut. We see the same thing on the English side. We also know the source of these, and it’s not suprising he would have stuff like this. CGC also authenticated it. They aren’t perfect but all things considered their opinion is valuable.
And on the other side, there’s no obvious reason to think these are not authentic. But it’s still a weird item which is where my 4% hesitation comes in. But I really think if someone has strong doubts about these, that says more about what they want to believe than anything really demonstrable.