About 2-3 weeks later we mailed Yellow Letters to that same group of owners and our response rate essentially quadrupled.

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As a real estate agent licensed in Indiana you would just get your proof of funds letter ready or have the funds in your account and showing this by means of a bank statement and then having the seller sign a purchase agreement. 

If he doesn't comply immediately maybe send him a termination letter Just a thought Good Luck?

The metro Atlanta area can typically provide double digit returns on investment properties.

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IMO the best bang for your buck will be marketing. 2k in letters could gross you 20$k in fees. 

Should I just send them a letter asking if they want to sell?

There is another one that you should do (starts with an L also...maybe 4 letters...?)

I politely stated that they must have a tax delinquent list if they send letters out to the owners of these properties to let them know they are delinquent on their taxes.