Anything sent via "bulk rate" or "pre-sorted" mail is clearly NOT a legit firm contacting you for a legit prize...

Funny story about a contest winner, though. Years ago, one of my clients held a contest where they were giving away a brand new computer, monitor, printer & the works. The lady that won, of course, had refused to provide a correct telephone number and wasn't answering my numerous letters asking her to call us and verify a convenient way of shipping her prize to her.

Finally, the client told me to ship it anyway. By then the prize was discontinued and so I substituted with something comparable. A few days later I received a FURIOUS phone call from the lady about how she didn't order the merchandise and wasn't going to pay for it.

Eventually I convinced her she really had won it :)