Way back when, Blockbuster used to use Travelmasters to rent the systems out to customers. Back before CD-based systems, which would break because of the abuse they took in transit, they used to do Genesis, SNES and NES rentals. Extortionate as I remember, something like $15 or $20 a night. I rented an SNES once, couldn't wait till christmas
I didn't know these had cartons, I thought these are just something specifically for Blockbuster. I'm sure most of these got junked that BB was using, making it a doubly interesting find.