In the book skellig what food is 27 and 53?

In the book "Skellig" by David Almond, the protagonist Michael finds a mysterious creature named Skellig in the garage of his new home. Skellig is initially described as being surrounded by empty Chinese food containers labeled with the numbers 27 and 53. These numbers do not have a specific meaning in the context of the story but serve to create an atmosphere of mystery and intrigue around Skellig and his origins.