That neg is removable.

I got a neutral removed because the buyer made a vague reference to me not responding to messages. I called eBay, they saw the buyer made no attempt at all to message me, and removed the feedback on the spot - it didn't matter at all whether or not their primary complaint (supposedly missing items) was true or not - I believe they got everything but either way the feedback comment contained a verifiable lie, so off it went.

If you also have tracking that shows delivery, then that feedback contains 2 verifiable lies, and eBay should remove it without question. 

You can use eBay chat, or the call me back feature to get in touch with them. 

Has the buyer left the same or similar feedback for other sellers? (Sometimes when leaving FB on mobile devices, it auto-fills their last comment and some buyers have been known to leave several negs for different sellers, when it was only meant for one). I had a buyer accidentally do that with me, so it's now my one and only revised feedback comment.