Open Jobs?

Over the past few weeks, the number of I.T. jobs in the Sunday newspapers seems to have increased but something has me rather puzzled. Why would technology positions be listed that require resume submittals only by snail mail? Shout not there be an email address, web site link, or at least a fax number? Are the multitude of rather similar opportunities, with only mailing addresses listed and concentrated around 3 or 4 locales in Central NJ, for real or is something going on here?

Has anyone sent their resume to any of these ads? Have you received any sort of reply? Please enlighten me as I am more than a tiny bit curious!