Some marketing dude was giving them out in handfuls in the weeks preceding the show's first preview.
They were passing those things out like candy in attempt to get anyone to buy tickets, or at least just get rid of them so the marketing team could go home.
Shillsville on the streets of NYC was the marketing campaign for IN MY LIFE.
If there had been an intermission, the entire audience would have been gone by the start of Act II. Joe Brooks knew that, so he kept it at an intermissionless 2+ hours.
"Winning a Tony this year is like winning Best Attendance in third grade: no one will care but the winner and their mom."
-Kad
"I have also met him in person, and I find him to be quite funny actually. Arrogant and often misinformed, but still funny."
-bjh2114 (on Michael Riedel)