For some reason that doesn't look like a flat nock. Be very careful in shooting incorrect nock, as it will void all warranties.
How would they prove what bolt/nock was used?
You would be surprised in what they can see. When I worked at the archery shop, people would come in with an excuse on how they damaged their bow, and usually within 15- minutes, and after talking to them, they would come clean on what they did to the bow to damage it.