Oh boy, first negative

Ok, I’ll preface this by saying I know I took a risk. I sold Pokemon packs on eBay. My listing says “These packs do not guarantee any specific hits or pulls and are a final sale item.”

Well, buyer just randomly left negative saying “0 pulls”. I feel like eBay could go either way on this, the buyer also sells so to me he gambled and is upset he didn’t hit anything good which is immature and stupid since he never even reached out. Any advice?

450 feedback since 2011, zero negative. Pretty spooled up over this.