Punching leaves - how creative Beth!
Something I tried this year was simply wiping pretty leaves with glycerin and pressing between brown paper bag paper for 10 days or so. The leaves stay supple and won't crack, but they do lose a bit of their intensity.
I wonder, if one wants to keep their punched leaves for future decorating, I don't see why treated leaves would not work. I am surprised that the punch did not stick. I am going to have to try this, the kids will think it is fun! Thanks for the idea and have a blessed Thanksgiving.