Pigeon Ate Chocolate! No Vets Open Near By! Help!

I turned away for like one minute to go get something in the kitchen and saw my pigeon near my plate. Not abnormal behavior. He moved away from the plate which had a chocolate chip cookie from Costco on it and went back to his cage after I came back to the room and sat on my bed. He flew back down on my and that when I saw some melted chocolate on his beak. I wiped it off with a wet paper towel. This happened less than on hours ago as of this post. What do I do?