Pretty cool finding as I was going through a bunch of cards in a binder I got a while back for a steal. I was taking out the bonus cards within and organizing them into penny sleeves and top loaders and I noticed the All-New Series 7 B1 Bonus Card Leaky Leslie did not have a glossy back. I thought the entire run of the ANS 7 bonus cards backs must have skipped the glossy coating. Maybe my doubles of the B1 are the same and thus the same for everyone that has it in their collection but that is not the case. I checked the other two extras and they were glossy backs. Looks like we have a possible matte back variation of this card.
If anyone cares to look into their ANS 7 B1 cards and see if we have a potential new variation discovery in our hands. That would be totally awesome!
I provided pics below under a light source so you can tell the difference.