These sketches were tissue roughs for Post ceral boxes, created back when art directors could draw, though it wasn't called drawing then (illustrators did that) it was "comping", and required unlimited exposure to toxic markers and other items now stocked only in The Museum of Forgotten Art Supplies.
Guess "Digits" didn't make it out of focus group testing. Cannibals being a limited niche market and all. From the treasure troves of Dan Goodsell who displays more from his impressive collection here.