Ebay advice

I sold a coin last sunday in an auction on ebay. Its been 6 days, high bidder has not paid nor has he replied to emails I have sent. At what point can I offer it to the underbidder via a second chance offer?
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Ike Specialist
Finest Toned Ike I've Ever Seen, been looking since 1986
My Early Large Cents
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<< <i>File the dispute and send him a message that you did so to recoup your fees. Opening the dispute sometimes motivates buyers to pay. Can't really re-sell the coin until it is clear the buyer is not going to pay. >>
I filed it yesterday, I notice he has gotten positive feedbacks for items he won after mine, so he just obviously is having buyers remorse and is ignoring me. All his feedbacks are for $20-$30 items and the coin he won from me was $400. Just a big waste of my time. Luckily it doesnt happen very often.
My Early Large Cents
Buyers still have the upper hand. They can back out of a closed deal with absolutely no negative ramifications.
Ike Specialist
Finest Toned Ike I've Ever Seen, been looking since 1986