Have any of you accepted a shop and then complete it and realize how obvious the mystery shopper is? One store I completed you must use the restroom. The restroom is only open if you ask a staff member to use it. As soon as I come out, the sales people are all over me! Another shop you must make a purchase but use an expired credit card or enter the pin wrong. Can we be more obvious? I don't complete either of these shops anymore :-)
Well, I guess it all depends on how well can a shopper "act it out" and make the situation sound believable. Although I do think that if multiple shoppers come to the same store in the same month and present the same (rare) scenario, it can get a bit suspicious - but MSPs keep this in mind when setting up scheduling rules and limitations, to make sure the shopper's aren't revealed.