J. Stevenson's arrangement is at the Levy collection:

Title: Oft in the Stilly Night. Scotch Air From Moore's National Melodies.
Composer, Lyricist, Arranger: Arranged by Sir John Stevenson, Mus. Doc.
Publication: Baltimore: John Cole, n.d..

Title: Oft in the Stilly Night. Scotch Air. From Moore's National Melodies.
Composer, Lyricist, Arranger: Arranged by J. Stevenson, Mus. Doc.
Publication: New York: N. Thurston, n.d..

Title: Oft in a Stilly Night. A Favorite Ballad. [Includes text to "Oft in my Visions Bright," Words by George P. Morris, Esqr.]
Composer, Lyricist, Arranger: Arranged for the Piano Forte by Sir John Stevenson.
Publication: Boston: Oliver Ditson, 115 Washington St., n.d..