Right now I am participating in the launch (via Zoom) of a new website, Manuscript Hunters– the result of a project at the University of Munich with wonderful resources on "manuscript hunters" like Tischendorf, Dunlop-Gibson and Smith-Lewis, Curzon, and many more. There are many fine resources here with timelines, illustrations, bibliographies and other features. The website will be updated continously.
I have not looked at the website in any detail yet, so I do not know to what degree they have included critical perspectives relating to cultural theft, or (fantastic) discovery stories (see for example Eva Mroczek's article in Marginalia here).