I assume cereal boxes back then were the same as now and just cardboard? I came across some paper/cardboard gaskets once or twice in my life and I was shocked because they basically turned into shredded wet mush when I took the thing apart.Growing up, we never threw away cereal boxes, they got flattened and saved for fuel pump and water neck gaskets.
Whats the reason to use a paper cardboard gasket instead of rubber?

