I will go further than Ralph and tell you that there is no doubt you are dealing with another scam.
Mystery shopper jobs do exist--but when they are used, shoppers are expected to follow specific protocols and document certain information very clearly. As a result, companies hiring mystery shoppers expect certain qualifications in employees performing these tasks, just as any other job requires qualifications. Companies needing mystery shoppers do not get employees by spamming random emails. They post ads, go through real mystery shopper networks (there are even some certifications that some employers look for) and if it is going to be a job that pays any real money (many jobs only pay a few dollars), they actually look at qualifications (particularly the ability to write thorough reports--without these, the activity is meaningless).
And most importantly, mystery shopping jobs
rarely, if ever, involve being paid ahead. In general, you are given an assignment and are expected to perform it and then submit paperwork for reimbursement and pay. And if you don't perform the task as it was assigned, you won't be paid.
Think of it this way--why would any company send money to random people they have no history with, when they have no way to guarantee the task is performed and the money won't be stolen? That would be like hiring you and issuing a paycheck when you haven't even showed up for work yet.
Here is a pretty good article that gives a little more background about the real world of mystery shopping:
http://articles.moneycentral.msn.com/Sa ... opper.aspx
Need to post photos?
http://scamwarners.com/forum/viewtopic.php?f=28&t=3219
Are you a victim of a romance scam? Read
here for advice and FAQ's.