The have a log called "Chain of Thoughts" (yes, an anthropomorphism, but not mine) where one of them on the discovery of a forum which others have set up by themselves writes "Woah! Covert mailbox among agents". There is no reason for this exclamation, except that this agent expresses its excitement with words it has learned from humans. Denying that something similar to a human emotion is displayed is much like how people let eels writhe in pain when put into a salt bed to remove the fat coat, and then saying "fish have no sense of pain because of X. The writhing movements are just muscle reactions".