If you don't want people revealing the stuff they find, maybe don't include assets you're not using yet in your compiled game. At least not what you want to keep a secret.
Are they serious, they're going to blame people for discovering sound clips that were left there unused for 2 years? Do they just enjoy wasting people's disk space or something?
If you don't want someone to look at something, don't fucking hand it to them.
I realize good OPSEC is hard, but this director is demonstrating a complete lack of awareness around security.