When I installed the game on a different device, I was able to "restore purchases" which unlocked the campaigns I had purchased (well after I finished the campaigns I needed to finish to unlock the chance to purchase them) and got my defense pack. If you got the Carl's Funhouse campaigns back when they were free, you might have to pay to unlock them if you reset progress - I'm not sure how that works.
Tcarr9's Tiny Heroes video walkthroughs are available on YouTube:
http://www.youtube.com/user/Lordkalvanmidnight