For the folks passing through: "Mystery Shopper" is a well known job offer scam. In involves you getting a check & asked to deposit it. In 2-3 days the check appears to clear, meanwhile the scammer will ask you to send money, using a cash wire transfer service, to 'someone'. Then in 4-6 weeks the check bounces. The rest is pretty simple to figure out. A very popular version of this is the 'car wrap scam'. Just do a web search on that phrase.