Got my check a week ago. It is a weird looking envelop and check, it does look like advertising. It is not clearly from S&W, when you glance at the envelop. So don't throw it away.
There is another S&W mail in rebate going on through September, for M&P full size and compact pistols and Shields: two mags, two boxes of ammo, and a mag loader. Not a bad deal if you are in the market for one.