It is frequently thought that the over sized Altemus books did not originally have dust jackets (or boxes).
The two books of this series (http://henryaltemus.com/series/series172.htm) are 10 x 7.75. Although the jackets are hard to find, they most certainly exist.

New to the database is this dust jacket for book #1 Peter Rabbit Story Book. This jacket dates from 1930 since there are books advertised on the reverse published in 1930 but not 1931.