starlightexp
With reverse image searches/alerts it's thankfully a lot easier for you to find where copies of your images are being posted around the interwebs and I'm guessing Museums (given their limited revenue and constantly fighting for funding to keep their doors open) would have a staff member monitoring this stuff since one of the only ways they can make money is through their merchandise which they can now sell online... Books, umbrellas, cards, dishware, etc, printed with images of the art they own.
An academic printing of something is very different from a commercial printing (such as this deck).
PS - what's the BnF?
Bibliothèque nationale de France