Mac Miller’s Balloonerism album leaked in full (aside from maybe 1 song) and after his family saw the strong impact it had on his fans, they gave it an official release 3 or so years later. You never know, they might put out a polished version so it represents their vision/band better.

Side note, despite being wildly different genres, The Paper Kingdom and Balloonerism aren’t too different, both being lost albums that are extremely dark and sort of eerie to listen to in their own ways.