Of course the scam did not originate with the MSPA and if you had Googled them you would have arrived at their home page at [
www.mysteryshop.org] which has in large red letters "Watch for Scammers" and "Urgent: scam scam scam" warnings. Your very first clue that this was a scam should have been the @AOL.com email address. The MSPA is a professional organization of companies that do mystery shops and I am sure generate email from some email server that would not be @AOL.com or @hotmail.com or @gmail.com etc. Chances are that your scammer is somewhere in Canada, Nigeria or Rumania and while there is cooperation between the USA and Canada in going after scammers, for the rest you are SOL.
Common sense tells you that nobody send a total stranger money for future performance they hope will be done. Common sense tells you that you will not be able to purchase real prescription drugs over the internet without a prescription. Common sense tells you that you will not be earning 'safe, secure and guaranteed' 15% interest in an overseas bank account when the worldwide rates are less than 5%. Common sense tells you that a 'genuine replica' Rolex watch for $50 is a cheap knockoff. Common sense tells you that you will not be earning $100 or more per day stuffing envelopes or 'processing rebates'. If you fell for the scam and deposited the check you received, I can only offer a little sympathy. While it would be wonderful if scammers got put out of business, there are and will always be those who try to abuse others so your best defense is common sense and skepticism.