The documents in your envelope list Collegiate Academic All-America Team Members of the Year. The Academic All-America program recognizes combined athletic and academic excellence of the nation's top student-athletes.
The number of All-American Athletes is written in Morse Code. The Mystery code uses the names of the sports and the number of athletes associated with them.
Use Morse Code to solve for the four digit code.
Samuel Morse: Samuel Finley Breese Morse (1791-1872) was an American inventor and painter. After a successful career in painting, Morse built the first American telegraph around 1835. A telegraph sends electrical signals over a long distance, through wires. Morse used a dots-and-spaces code for the letters of the alphabet and the numbers. The telegraph revolutionized long-distance communications. http://www.enchantedlearning.com/morsecode/