As I expected he got very sad and emotional when he saw the photo but bed time was not a disaster. He did cry and say that he missed his mom and then it happened. I heard for the first time "You're not my real mom." I knew this day would come and those words would be uttered but I just didn't know when it would happen. I honestly expected it to be when he was angry with us, not just upset and missing his birth mom. I imagine I will hear this many more times over the years and I will have to learn how to respond. I do not remember what exactly I said to him in the moment, I did try my best to acknowledge his feelings and let him know that it is perfectly normal to miss his mom.
We do have more photos but I need to get them scanned into digital format before I hand them over. I have heard horror stories about kids destroying the only copy of photos that existed and I do not want that to happen. Should a photo get destroyed we will definitely have a back up. For now he seems happy with the 1 photo he has.