Buyer left negative feedback where they inquire about delivery time. At the same time buyer opened "Item not received" case.
Buyer was contacted via eBay message within 1 hour with offer to re-send item or give immediate feedback. Call was made to the same buyer's phone number with with the same message. Buyer never responded.

The next day buyer closed "Item not received" case indicating the item was received. Feedback revision request together with messaging and phone call, however negative feedback was not removed.

Here is a punch line: We contacted eBay and spoke to "Korine". Per Korine, the fact that buyer closed "Item Not received" case and indicated that item was received in "NOT INDICATION TO EBAY THAT ITEM WAS RECEIVED"

So, the moral of the story: Nothing new, bad buyers are still out there and eBay, as always, employs "quadrupeds".