'Attempted Bloggery' found an incomplete drawing by Searle with a Santa sketch. (The recipient was his U.S. rep. Eileen McMahon). In his archive I remember seeing a collection of xeroxed pages Ronald had made of this drawing and others for the NY Times Book Review (7th September 1997). Ronald was known to art directors and art editors as a professional who would not only dispatch artwork on time but they would often be happily surprised to receive a whole batch of ideas on the same theme for them to pick from. This seems to be the case here where Ronald has offered a variety of Santa gags, perhaps for a 'Books for Christmas' feature? I can't find any reference to this artwork on the NY Times archive website. Maybe someone will be able to find a back issue for me?
Searle explored the 'art museum guard' situation several times over his career.
An Arcimboldo-like Santa comprised of Christmas dinner!
Santa delivers a giant bottle of ink on his nib-antlered reindeer!
More Christmas Searle here