Find two DRM epub books in database

I was notified by tech support that I have in my database some unsupported EPUB files, likely with DRM: 673015807.epub and 682216017.epub. For the life of me, I cannot find them. Help?

Do a toolbar search for extension==epub and view each result.

Thus, two ==, right? Neither “extension=epub” nor “extension==epub” produces any results.

Please respond in your active support ticket.