When I renewed mine about 4 yrs ago after I got married, they sent my old one back with a small hole punched through it so that it was invalid. I BELIEVE they came together, but it was a few years ago. The procedures are always changing. They have changed since I first applied for my infant son's this past summer. Leave it to the government! ; )
I was glad they sent it back because it's so nice to look back at the old stamps and remember past trips.
Hope you get yours back soon.