I had the same letter about the mystery shopping. I went to the bank a day after I recieve the check and it came in tmy bank that it was invalid. So, I left to do a research on the check and the name on the check did not exist but also because the check return address is in canada. I firmly suspect that it was a fraud check. So, for all those who run into a possesion about this matter. Don't take your time with this money and let it known to those you know to stop them from making a big mistake.