AutoCAD 2010/2011/2012 DWG Format

[#1]

a couple of weeks ago i was looking through the Sample Projects 2012 folder located in my autodesk folder. there was some pertinent information i could use for another project located in the folder.  It's a few weeks later now and the folder no longer contains any of the floor plans, elevations, sections, etc that it had before.  im very confused as to what happened and was wondering if anyone had the answer, or knows where i could find this sample project on the autodesk website.  i would highly appriciate any kind of help, thanks.