Bundled apps disappeared after factory reset

Hello guys, I purchased a Macbook Air 13'' on 2012 December which comes with Mountain Lion and pre-installed iLife. Today I needed to do a factory reset and after that I couldn't find the iPhoto and iMovie. they're available only for purchase on app store. I read in some posts that I needed to re-install the bundled apps through a DVD but my mac didn't come with any DVD.

Is there any way to recover these apps?

Thank you.