Allmusic.com says I ATE THE BOLONEY (note spelling) was written by Harry Lee and recorded by Billy Murphy; it's on "Yankee Doodle Boy," ASV/Living Era #5608, 2005.

The National Library of Australia has the sheet music, but does not have the images online, probably because it's still under copyright. Here's the catalog entry:

Author: Lee, Harry
Title: I ATE THE BOLONEY [music] / by Harry Lee.
Publisher: Melbourne: L. F. Collin, c1926.
Description: 1 score (3 p.); 32 cm.
Notes: For voice and piano. Includes chord charts for ukulele.
Cover title.
"Specially featured by "Ukelele Bob" Williams, at J. C. Williamson's Tivoli Theatres".
"This song includes special ukulele accompaniment".
"Hoey and Lee's famous 'boloney' song".
Subjects: Popular music --1921-1930.
Vocal music, Australian --1900-1930.
Other Authors: J.C. Williamson (Firm)
Collect from: Petherick Reading Room (Music Collection)
Call Number: MUS N mba 783.242 L478