A warning was issued as late as 1944:
http://www.lonesentry.com/blog/germa...rfly-bomb.html
And apparently, they were used elsewhere. I seem to recall a photo of an American soldier, on the continent, pointing to a large white sign that had an inert butterfly bomb held on with a piece or two of black tape. Underneath were words to the effect: Danger! Butterfly Bomb. Watch out for these. Do not handle! Report immediately if found!
Ed