Unfortunately eBay is not going to do a thing to this buyer. I called them about a similar situation last week.
Someone won a handbag in my auction and did not pay. They had 100% (19) feedback and I was not concerned until day 7 with no payment. I took a look at their 100% feedback and it was full of false positives. I immediately opened a case knowing they would not pay but wanted them to receive a strike......which they did receive. I went a step further and emailed a couple of members that left the false positive feedback and asked them if they opened a case. No one did!! It seems that only a small percentage of small time sellers like me even know how to go about doing this. This is why these type of buyers reak havoc on eBay. Although these false positive feedback remarks are against eBay rules and actually increased this loser's feedback score I found them to be helpful in my situation only because it gave me a little history on this buyer.
In the case of the OP here......if no one had left the feedback this buyer would have had a 0 feedback score and would not have been able to place bids on your auction if your buyer requirtements are set to restrict 0 feedback buyers.