I just got done checking my sources and here what I know and I will quote:

Will ShadowShopper.com ever send a job to me via regular mail?
Never. We will always contact you via email. If you do receive a letter in the mail claiming to be from ShadowShopper (with a realistic looking logo) and asking you to mystery shop by cashing a large check THROW THAT OFFER AWAY. It is a Nigerian check scam ring pretending to be Shadowshopper. The scam is run out of Canada and the UK, and the check will bounce. Remember, ShadowShopper provides you with hundreds of job opportunities, and for your protection, we do it only via email and our website.

[via Common Questions]

It is a Scam to send you money Via the postal mail and that is why you must not believe what you get in the mail. This is in response to someone telling me they got a check with a different name but for the same reason to cash the check and send money to them.

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If anyone has any information they would like to add about this by all means talk about it in the comments. I want to hear where the check cam from or who sent it. You should also check out my other article about Nationwide Marketing that is also a Scam.