Just want to thank the person that wrote the thread about what to look for when it came. He was right because it could have easily been mistaken for junk mail.
Got mine today and it was rather tattered. It really had some pressure put on it because the outline of the envelope flap was pressed into the check.

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Mighty 90's,Trying 4 a 100!

Yes, the rebate comes in a small 3 1/2" x 6 1/2" envelope with MPS Inc. as the return address.

Got mine yesterday, mailed it off mid-june.