Hey, that's my Ran-A-Way sketch card!!! Cool!
It sounds like one bonus set of these three cards will be sent to each backer receiving a physical reward. If that is in fact the case, I won't be able to include them for the people here I'm helping.
With 525 backers, 18 of which are digital only, that leaves 507 bonus "Attacky Packages Old School" sets of three cards.