@Classj I know the exact date. We received the letter Saturday, February 15, 2014 and it was dated 02-14-2014. We live in the DFW metroplex.
Here is a link to last years thread: http://talk.collegeconfidential.com/southern-methodist-university/1607148-hunt-leadership-scholars-program-p1.html
Last year, the finalist invitation letters were mailed in large white envelopes. The “sorry” letters were standard size. Finalist’s also received a personal phone call about a week later to ensure the letter was received.
Best of luck!