It would be interesting to see the xray. I wonder if the 2 ceca can be seen on xrays. Where in the digestive tract did the vet see the 2 objects? Here is a diagram of the hen:
https://www.anatomynote.com/wp-content/uploads/2020/02/19765/Anatomy-of-the-chicken-diagram.png
https://www.anatomynote.com/wp-content/uploads/2020/02/19765/Anatomy-of-the-chicken-diagram.png