We are a small nonprofit educational org and are using Office for Mac 2011.  I wanted to archive my emails from the year 2010, so I created a folder called "Older" and dragged 5,000 emails to it.  They literally disappeared.   I have checked my computer for all  ".pst" files; and I went to the  Apple "genuis bar" where a trained tech looked for these email files -- they could not be found.  Please offer guidance for finding these!