Agree with many above. If you decline an offer or decline and counter offer, the offer you received is gone. You declined it. No obligation exists on the buyers part and you have no right to it as a seller. Good luck.
Offer / counter-offer? Audiogon rules
I am a seller. I receive an offer. I immediately counter-offer. The potential buyer declines it. Is the buyer still bound to his original offer for the orignal 48 hrs.?