I can also encourage you good people to check things that look like real, actual junk mail -- which is how many product manufacturer rebates come these days. You go to all the trouble to document, photocopy, fill out, kiss, mail, postmark, etc. ... then it takes so long for the things to process that you completely forget there's $10 or $30 or whatever coming back to you on some purchase. Then one day you get one of those crappy looking little card-stock things that looks for all the world like just another advertisement, an "offer" for reduced mortgage rates, or whatever... but you open it, and there's yer thirty smackers.
This is how They get you.