I completed, 62500 and 65196, the books for the Disney Fairy Tale sets. Pending cleanup I am looking for a proper name.
Brickset calls them rather awkwardly:
65196: DESIGN PLATE, BOOK, W/4.85 HOLE, NO. 1
65200: DESIGN PLATE, BOOK, W/ 4.85 HOLE, NO. 2
Looking up Bricklink, there are similar purposed parts in the "Container" category.
What about:
65196: Container, Bookcover 16 x 12 x 2.5 with two Pinholes and Studs on Three Sides
65200: Container, Bookcover 16 x 6 x 1 with four Pinholes and 4 x 16 Studs and Embossed LEGO Logo
Have a look:
Brickset calls them rather awkwardly:
65196: DESIGN PLATE, BOOK, W/4.85 HOLE, NO. 1
65200: DESIGN PLATE, BOOK, W/ 4.85 HOLE, NO. 2
Looking up Bricklink, there are similar purposed parts in the "Container" category.
What about:
65196: Container, Bookcover 16 x 12 x 2.5 with two Pinholes and Studs on Three Sides
65200: Container, Bookcover 16 x 6 x 1 with four Pinholes and 4 x 16 Studs and Embossed LEGO Logo
Have a look: