Some good Secret Santa messages are poems such as, "It's not a house, a car, or a boat. It's a Secret Santa gift with a silly little note!" and "A gift for you, you don't know who. Must be Secret Santa."
Good Secret Santa messages can be riddles, teasing the receiver of the gift about the true identity of the Secret Santa, where the present is located or what the present is. Adding an additional puzzle to the message increases intrigue and interest, such as penning the message in invisible ink that can be revealed by black light. Hints may be required, so the puzzle can be read or solved.