Not to worry. Those are just the extra Chicago ballots from Kennedy v. Nixon in 1960.
The drama behind President Kennedy’s 1960 election win
Constitution Daily–The race between Kennedy and Nixon had been close all fall. The candidates were tied in a late August Gallup poll, and Kennedy took a three-point lead after his historic TV debate performances. But Nixon gained momentum heading into Election Day, and he cut Kennedy’s lead to one percentage point in a poll taken four days before the election.
Kennedy defeated Nixon when votes were finally counted in the Electoral College, by a margin of 303 to 219. But in the popular vote, Kennedy won by just 112,000 votes out of 68 million cast, or a margin on 0.2 percent.
So arguments persist to this day about vote-counting in two states, specifically Illinois (where Kennedy won by 9,000 votes) and Texas (where Kennedy won by 46,000 votes). If Nixon had won those two states, he would have defeated Kennedy by two votes in the Electoral College.