This is equivalent to a Christian fundamentalist saying "God works in mysterious ways".You think Israel is going to reveal their intel sources?!?!
There is no evidence to support your claim of fact. Your belief in the infallibility and morality of the IDF is not evidence of fact. But then, why should you start producing evidence of fact now?
The point is you're asking for evidence they certainly wouldn't provide. However, we do have some indirect evidence:
https://www.camera.org/article/human-rights-watch-and-its-tunnel-deceptions/
Hamas won't allow the UN to see where one of the tunnels was.