bingo card
bingo card {n.}, {slang}
A response card, bound into a periodical, containing numbers keyed to editorial or advertising matter, giving the reader the opportunity to send for further information by marking the numbers of the items he is interested in; such a card can be mailed free of charge.
Jack thinks he is saving time by filling out bingo cards instead of writing a letter.
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Source: A Dictionary of American Idioms