"Hungry Hobos" was one of 26 episodes featuring 'Oswald the Lucky Rabbit', a character created by Disney and cartoonist Ub Iwerks in 1927 for Universal Studios.
"We've got more films than you can imagine," said Robert Dewar, commercial director of Huntley Film Archives, one of Britain's biggest independent film libraries.
Dewar confirms that only 40,000 of the archive's 80,000 catalogued films have been accounted for.
"'Oswald' is a proto-'Mickey'," said Dewar. "If you see him, you see the same shape of the head, the ears, the mannerisms".