The mystery shopper check scam is a variation on a long-running scam where the scammer sends a check and asks their intended victim to wire most of the money back to them or another party, often in a foreign country. Every day there are reports of more people getting caught up in this scam, often losing thousands of dollars.
The National Consumers League has launched a web site designed to educate consumers about these scams at http://www.FakeChecks.org/. The site explains how the scams work, the signs of a scam, and how to protect yourself. Although FakeChecks.org does not specifically mention the mystery shopper scam, it works much the same way as the other fake check scams.
If you receive a check from a company that says you have been selected to be a mystery shopper, do not cash it. You can report it to your local police or the FBI, or just destroy the check.
Educate yourself to keep your money safe.