Do Later Manuscript Discoveries Ever Support Proposed Interpolations?

It is fine, I think, for a post on the blog every now and then to get technical and into the nitty-gritty of scholarship.  And so I have no qualms about the following. Yesterday I posted a response to a question about “textual emendation” by Jan Krans, a New Testament textual expert who teaches in the Netherlands.  The same blog reader had a second question that I have also directed to Jan, and here I give both the question and the answer. The question has to do with my claim that there are some words/passages in the New Testament that *look* like they were added after the original was published, but for which we have NO manuscripts that lack the words/passage (so that there is no hard evidence that they were added after the text was originally published).   But has it ever happened that after a scholar suggested such a thing, a manuscript has turned up that provides actual evidence?  Here’s the interesting question about that, and Jan’s intriguing response. QUESTION: Do you know of [...]