I recently renewed my US passport, and when my expired document?
Since, in newer passports (starting in 2007/08 or there about) the ID page is no longer on the inside of the front cover, but rather a page or two deeper into the booklet, the cover may not need to be punched. I wonder if the ID page was on your old one. When I renewed my passport last year (old one issued in 2008), the old one was punched through the cover and the ID page.