I tried several timesto add a "credit only" attribute to Janathan Adams's credit in Bones episode #1.6. I also provided a link to the episode since this actor is not present there. What proof do you need to verify this?
You need to prove that they were recognisably in the episode. The best way to do that is usually with a screen grab showing them appearing in the episode as it was first screened. It needs to clearly show that it’s an extract from the episode, not just a behind the scenes still showing that they were on the set.