Black canvas bag containing 2 books

I got off the Airlink 747 at Dublin airport, and forgot a black canvas bag with 2 books inside. I was sitting upstairs right at the front. The bag had an emblem and "dark lands - national leprechaun museum" in white on it. The one book was green, with gold embossing, the other book was black/grey with a white figure on. Both books were about the mythology and legends of Ireland.