lol..i'd say over 80% are scams. it makes it hard to find the good ones.
i had that happen with yard sales too. only saving grace was that the city i lived in gave rain checks.
i saw the stuff envelope idea. many realtors and insurance agents hire people to do their mail outs. i have gotten many with hand written envelopes.
wish you were close to me. i'm the one who does all of our mailouts. i would sit and do them while watching csi.